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Finding the Fourth Proportional to 71,762.48, 99,020.40 and 39,930.56

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Solution

The fourth proportional to 71,762.48, 99,020.40 and 39,930.56 is: 55,097.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,762.48 : 99,020.40 = 39,930.56 : x
  2. Step 2: Convert to fraction form
    71,762.48/99,020.40 = 39,930.56/x
  3. Step 3: Cross multiply
    71,762.48x = 99,020.40 × 39,930.56
  4. Step 4: Simplify right side
    71,762.48x = 3,953,940,023.42
  5. Step 5: Solve for x
    x = 3,953,940,023.42/71,762.48
  6. Step 6: Final answer
    x = 55,097.59

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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.