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Finding the Fourth Proportional to 15,000.38, 20,698.90 and 8,285.68

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Solution

The fourth proportional to 15,000.38, 20,698.90 and 8,285.68 is: 11,433.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,000.38 : 20,698.90 = 8,285.68 : x
  2. Step 2: Convert to fraction form
    15,000.38/20,698.90 = 8,285.68/x
  3. Step 3: Cross multiply
    15,000.38x = 20,698.90 × 8,285.68
  4. Step 4: Simplify right side
    15,000.38x = 171,504,461.75
  5. Step 5: Solve for x
    x = 171,504,461.75/15,000.38
  6. Step 6: Final answer
    x = 11,433.34

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Half scale
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Double scale
Find fourth proportional to 15,001.38, 20,700.28 and 8,286.68
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.