Home / 78,345.10-117,517.65-74,932.30

Finding the Fourth Proportional to 78,345.10, 117,517.65 and 74,932.30

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Solution

The fourth proportional to 78,345.10, 117,517.65 and 74,932.30 is: 112,398.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,345.10 : 117,517.65 = 74,932.30 : x
  2. Step 2: Convert to fraction form
    78,345.10/117,517.65 = 74,932.30/x
  3. Step 3: Cross multiply
    78,345.10x = 117,517.65 × 74,932.30
  4. Step 4: Simplify right side
    78,345.10x = 8,805,867,805.10
  5. Step 5: Solve for x
    x = 8,805,867,805.10/78,345.10
  6. Step 6: Final answer
    x = 112,398.45

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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.