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Finding the Fourth Proportional to 15,139.84, 20,892.64 and 8,425.28

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Solution

The fourth proportional to 15,139.84, 20,892.64 and 8,425.28 is: 11,626.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139.84 : 20,892.64 = 8,425.28 : x
  2. Step 2: Convert to fraction form
    15,139.84/20,892.64 = 8,425.28/x
  3. Step 3: Cross multiply
    15,139.84x = 20,892.64 × 8,425.28
  4. Step 4: Simplify right side
    15,139.84x = 176,026,341.94
  5. Step 5: Solve for x
    x = 176,026,341.94/15,139.84
  6. Step 6: Final answer
    x = 11,626.70

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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.