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Finding the Fourth Proportional to 10,935.30, 16,419.15 and 8,472.90

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Solution

The fourth proportional to 10,935.30, 16,419.15 and 8,472.90 is: 12,721.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,935.30 : 16,419.15 = 8,472.90 : x
  2. Step 2: Convert to fraction form
    10,935.30/16,419.15 = 8,472.90/x
  3. Step 3: Cross multiply
    10,935.30x = 16,419.15 × 8,472.90
  4. Step 4: Simplify right side
    10,935.30x = 139,117,816.04
  5. Step 5: Solve for x
    x = 139,117,816.04/10,935.30
  6. Step 6: Final answer
    x = 12,721.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.