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Finding the Fourth Proportional to 81,123.40, 121,569.90 and 59,897.80

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Solution

The fourth proportional to 81,123.40, 121,569.90 and 59,897.80 is: 89,761.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,123.40 : 121,569.90 = 59,897.80 : x
  2. Step 2: Convert to fraction form
    81,123.40/121,569.90 = 59,897.80/x
  3. Step 3: Cross multiply
    81,123.40x = 121,569.90 × 59,897.80
  4. Step 4: Simplify right side
    81,123.40x = 7,281,769,556.22
  5. Step 5: Solve for x
    x = 7,281,769,556.22/81,123.40
  6. Step 6: Final answer
    x = 89,761.64

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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.