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Finding the Fourth Proportional to 99,663.76, 137,529.96 and 57,218.32

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Solution

The fourth proportional to 99,663.76, 137,529.96 and 57,218.32 is: 78,957.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,663.76 : 137,529.96 = 57,218.32 : x
  2. Step 2: Convert to fraction form
    99,663.76/137,529.96 = 57,218.32/x
  3. Step 3: Cross multiply
    99,663.76x = 137,529.96 × 57,218.32
  4. Step 4: Simplify right side
    99,663.76x = 7,869,233,260.87
  5. Step 5: Solve for x
    x = 7,869,233,260.87/99,663.76
  6. Step 6: Final answer
    x = 78,957.82

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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.