Home / 78,489.11-108,314.70-42,679.20

Finding the Fourth Proportional to 78,489.11, 108,314.70 and 42,679.20

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Solution

The fourth proportional to 78,489.11, 108,314.70 and 42,679.20 is: 58,897.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.11 : 108,314.70 = 42,679.20 : x
  2. Step 2: Convert to fraction form
    78,489.11/108,314.70 = 42,679.20/x
  3. Step 3: Cross multiply
    78,489.11x = 108,314.70 × 42,679.20
  4. Step 4: Simplify right side
    78,489.11x = 4,622,784,744.24
  5. Step 5: Solve for x
    x = 4,622,784,744.24/78,489.11
  6. Step 6: Final answer
    x = 58,897.15

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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.