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Finding the Fourth Proportional to 71,887.92, 99,205.08 and 40,057.20

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Solution

The fourth proportional to 71,887.92, 99,205.08 and 40,057.20 is: 55,278.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,887.92 : 99,205.08 = 40,057.20 : x
  2. Step 2: Convert to fraction form
    71,887.92/99,205.08 = 40,057.20/x
  3. Step 3: Cross multiply
    71,887.92x = 99,205.08 × 40,057.20
  4. Step 4: Simplify right side
    71,887.92x = 3,973,877,730.58
  5. Step 5: Solve for x
    x = 3,973,877,730.58/71,887.92
  6. Step 6: Final answer
    x = 55,278.80

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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.