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Finding the Fourth Proportional to 15,047.70, 20,765.70 and 8,423.70

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Solution

The fourth proportional to 15,047.70, 20,765.70 and 8,423.70 is: 11,624.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,047.70 : 20,765.70 = 8,423.70 : x
  2. Step 2: Convert to fraction form
    15,047.70/20,765.70 = 8,423.70/x
  3. Step 3: Cross multiply
    15,047.70x = 20,765.70 × 8,423.70
  4. Step 4: Simplify right side
    15,047.70x = 174,924,027.09
  5. Step 5: Solve for x
    x = 174,924,027.09/15,047.70
  6. Step 6: Final answer
    x = 11,624.64

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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.