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Finding the Fourth Proportional to 15,139.20, 20,892.70 and 9,167.50

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Solution

The fourth proportional to 15,139.20, 20,892.70 and 9,167.50 is: 12,651.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139.20 : 20,892.70 = 9,167.50 : x
  2. Step 2: Convert to fraction form
    15,139.20/20,892.70 = 9,167.50/x
  3. Step 3: Cross multiply
    15,139.20x = 20,892.70 × 9,167.50
  4. Step 4: Simplify right side
    15,139.20x = 191,533,827.25
  5. Step 5: Solve for x
    x = 191,533,827.25/15,139.20
  6. Step 6: Final answer
    x = 12,651.52

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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.