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Finding the Fourth Proportional to 72,139.70, 99,553.10 and 39,434.78

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Solution

The fourth proportional to 72,139.70, 99,553.10 and 39,434.78 is: 54,420.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,139.70 : 99,553.10 = 39,434.78 : x
  2. Step 2: Convert to fraction form
    72,139.70/99,553.10 = 39,434.78/x
  3. Step 3: Cross multiply
    72,139.70x = 99,553.10 × 39,434.78
  4. Step 4: Simplify right side
    72,139.70x = 3,925,854,596.82
  5. Step 5: Solve for x
    x = 3,925,854,596.82/72,139.70
  6. Step 6: Final answer
    x = 54,420.17

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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.