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Finding the Fourth Proportional to 82,890.31, 124,336.32 and 66,355.47

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Solution

The fourth proportional to 82,890.31, 124,336.32 and 66,355.47 is: 99,533.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,890.31 : 124,336.32 = 66,355.47 : x
  2. Step 2: Convert to fraction form
    82,890.31/124,336.32 = 66,355.47/x
  3. Step 3: Cross multiply
    82,890.31x = 124,336.32 × 66,355.47
  4. Step 4: Simplify right side
    82,890.31x = 8,250,394,951.67
  5. Step 5: Solve for x
    x = 8,250,394,951.67/82,890.31
  6. Step 6: Final answer
    x = 99,533.89

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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.