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Finding the Fourth Proportional to 86,543.60, 129,815.40 and 42,256.85

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Solution

The fourth proportional to 86,543.60, 129,815.40 and 42,256.85 is: 63,385.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,543.60 : 129,815.40 = 42,256.85 : x
  2. Step 2: Convert to fraction form
    86,543.60/129,815.40 = 42,256.85/x
  3. Step 3: Cross multiply
    86,543.60x = 129,815.40 × 42,256.85
  4. Step 4: Simplify right side
    86,543.60x = 5,485,589,885.49
  5. Step 5: Solve for x
    x = 5,485,589,885.49/86,543.60
  6. Step 6: Final answer
    x = 63,385.28

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Similar ratio
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1.5x scale

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.