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Finding the Fourth Proportional to 86,652.20, 129,978.30 and 84,902.60

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Solution

The fourth proportional to 86,652.20, 129,978.30 and 84,902.60 is: 127,353.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,652.20 : 129,978.30 = 84,902.60 : x
  2. Step 2: Convert to fraction form
    86,652.20/129,978.30 = 84,902.60/x
  3. Step 3: Cross multiply
    86,652.20x = 129,978.30 × 84,902.60
  4. Step 4: Simplify right side
    86,652.20x = 11,035,495,613.58
  5. Step 5: Solve for x
    x = 11,035,495,613.58/86,652.20
  6. Step 6: Final answer
    x = 127,353.90

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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.