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Finding the Fourth Proportional to 15,147.94, 20,905.77 and 8,865.58

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Solution

The fourth proportional to 15,147.94, 20,905.77 and 8,865.58 is: 12,235.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,147.94 : 20,905.77 = 8,865.58 : x
  2. Step 2: Convert to fraction form
    15,147.94/20,905.77 = 8,865.58/x
  3. Step 3: Cross multiply
    15,147.94x = 20,905.77 × 8,865.58
  4. Step 4: Simplify right side
    15,147.94x = 185,341,757.38
  5. Step 5: Solve for x
    x = 185,341,757.38/15,147.94
  6. Step 6: Final answer
    x = 12,235.45

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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.