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Finding the Fourth Proportional to 86,375.68, 129,270.90 and 53,116.80

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Solution

The fourth proportional to 86,375.68, 129,270.90 and 53,116.80 is: 79,495.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,375.68 : 129,270.90 = 53,116.80 : x
  2. Step 2: Convert to fraction form
    86,375.68/129,270.90 = 53,116.80/x
  3. Step 3: Cross multiply
    86,375.68x = 129,270.90 × 53,116.80
  4. Step 4: Simplify right side
    86,375.68x = 6,866,456,541.12
  5. Step 5: Solve for x
    x = 6,866,456,541.12/86,375.68
  6. Step 6: Final answer
    x = 79,495.25

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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.