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Finding the Fourth Proportional to 78,689.16, 108,592.26 and 42,879.16

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Solution

The fourth proportional to 78,689.16, 108,592.26 and 42,879.16 is: 59,173.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,689.16 : 108,592.26 = 42,879.16 : x
  2. Step 2: Convert to fraction form
    78,689.16/108,592.26 = 42,879.16/x
  3. Step 3: Cross multiply
    78,689.16x = 108,592.26 × 42,879.16
  4. Step 4: Simplify right side
    78,689.16x = 4,656,344,891.30
  5. Step 5: Solve for x
    x = 4,656,344,891.30/78,689.16
  6. Step 6: Final answer
    x = 59,173.91

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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.