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Finding the Fourth Proportional to 136,030.53, 187,668.31 and 78,659.31

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Solution

The fourth proportional to 136,030.53, 187,668.31 and 78,659.31 is: 108,518.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,030.53 : 187,668.31 = 78,659.31 : x
  2. Step 2: Convert to fraction form
    136,030.53/187,668.31 = 78,659.31/x
  3. Step 3: Cross multiply
    136,030.53x = 187,668.31 × 78,659.31
  4. Step 4: Simplify right side
    136,030.53x = 14,761,859,773.47
  5. Step 5: Solve for x
    x = 14,761,859,773.47/136,030.53
  6. Step 6: Final answer
    x = 108,518.73

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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.