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Finding the Fourth Proportional to 86,753.25, 129,400.63 and 78,780.42

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Solution

The fourth proportional to 86,753.25, 129,400.63 and 78,780.42 is: 117,508.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,753.25 : 129,400.63 = 78,780.42 : x
  2. Step 2: Convert to fraction form
    86,753.25/129,400.63 = 78,780.42/x
  3. Step 3: Cross multiply
    86,753.25x = 129,400.63 × 78,780.42
  4. Step 4: Simplify right side
    86,753.25x = 10,194,236,225.85
  5. Step 5: Solve for x
    x = 10,194,236,225.85/86,753.25
  6. Step 6: Final answer
    x = 117,508.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.