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Finding the Fourth Proportional to 86,642.74, 129,668.41 and 72,618.60

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Solution

The fourth proportional to 86,642.74, 129,668.41 and 72,618.60 is: 108,680.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,642.74 : 129,668.41 = 72,618.60 : x
  2. Step 2: Convert to fraction form
    86,642.74/129,668.41 = 72,618.60/x
  3. Step 3: Cross multiply
    86,642.74x = 129,668.41 × 72,618.60
  4. Step 4: Simplify right side
    86,642.74x = 9,416,338,398.43
  5. Step 5: Solve for x
    x = 9,416,338,398.43/86,642.74
  6. Step 6: Final answer
    x = 108,680.06

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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.