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Finding the Fourth Proportional to 78,959.16, 108,965.20 and 43,151.38

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Solution

The fourth proportional to 78,959.16, 108,965.20 and 43,151.38 is: 59,549.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,959.16 : 108,965.20 = 43,151.38 : x
  2. Step 2: Convert to fraction form
    78,959.16/108,965.20 = 43,151.38/x
  3. Step 3: Cross multiply
    78,959.16x = 108,965.20 × 43,151.38
  4. Step 4: Simplify right side
    78,959.16x = 4,701,998,751.98
  5. Step 5: Solve for x
    x = 4,701,998,751.98/78,959.16
  6. Step 6: Final answer
    x = 59,549.76

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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.