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Finding the Fourth Proportional to 21,358.40, 29,472.42 and 12,407.80

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Solution

The fourth proportional to 21,358.40, 29,472.42 and 12,407.80 is: 17,121.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,358.40 : 29,472.42 = 12,407.80 : x
  2. Step 2: Convert to fraction form
    21,358.40/29,472.42 = 12,407.80/x
  3. Step 3: Cross multiply
    21,358.40x = 29,472.42 × 12,407.80
  4. Step 4: Simplify right side
    21,358.40x = 365,687,892.88
  5. Step 5: Solve for x
    x = 365,687,892.88/21,358.40
  6. Step 6: Final answer
    x = 17,121.50

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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.