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Finding the Fourth Proportional to 78,557.39, 108,518.53 and 75,640.94

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Solution

The fourth proportional to 78,557.39, 108,518.53 and 75,640.94 is: 104,489.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,557.39 : 108,518.53 = 75,640.94 : x
  2. Step 2: Convert to fraction form
    78,557.39/108,518.53 = 75,640.94/x
  3. Step 3: Cross multiply
    78,557.39x = 108,518.53 × 75,640.94
  4. Step 4: Simplify right side
    78,557.39x = 8,208,443,575.52
  5. Step 5: Solve for x
    x = 8,208,443,575.52/78,557.39
  6. Step 6: Final answer
    x = 104,489.78

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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.