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Finding the Fourth Proportional to 91,987.76, 137,819.60 and 65,555.84

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Solution

The fourth proportional to 91,987.76, 137,819.60 and 65,555.84 is: 98,218.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,987.76 : 137,819.60 = 65,555.84 : x
  2. Step 2: Convert to fraction form
    91,987.76/137,819.60 = 65,555.84/x
  3. Step 3: Cross multiply
    91,987.76x = 137,819.60 × 65,555.84
  4. Step 4: Simplify right side
    91,987.76x = 9,034,879,646.46
  5. Step 5: Solve for x
    x = 9,034,879,646.46/91,987.76
  6. Step 6: Final answer
    x = 98,218.28

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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.