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Finding the Fourth Proportional to 12,691.34, 17,522.68 and 7,913.20

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Solution

The fourth proportional to 12,691.34, 17,522.68 and 7,913.20 is: 10,925.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,691.34 : 17,522.68 = 7,913.20 : x
  2. Step 2: Convert to fraction form
    12,691.34/17,522.68 = 7,913.20/x
  3. Step 3: Cross multiply
    12,691.34x = 17,522.68 × 7,913.20
  4. Step 4: Simplify right side
    12,691.34x = 138,660,471.38
  5. Step 5: Solve for x
    x = 138,660,471.38/12,691.34
  6. Step 6: Final answer
    x = 10,925.60

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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.