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Finding the Fourth Proportional to 68,436.80, 102,642.24 and 28,995.20

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Solution

The fourth proportional to 68,436.80, 102,642.24 and 28,995.20 is: 43,487.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,436.80 : 102,642.24 = 28,995.20 : x
  2. Step 2: Convert to fraction form
    68,436.80/102,642.24 = 28,995.20/x
  3. Step 3: Cross multiply
    68,436.80x = 102,642.24 × 28,995.20
  4. Step 4: Simplify right side
    68,436.80x = 2,976,132,277.25
  5. Step 5: Solve for x
    x = 2,976,132,277.25/68,436.80
  6. Step 6: Final answer
    x = 43,487.31

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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.