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Finding the Fourth Proportional to 120,842.52, 180,972.12 and 72,672.60

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Solution

The fourth proportional to 120,842.52, 180,972.12 and 72,672.60 is: 108,833.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,842.52 : 180,972.12 = 72,672.60 : x
  2. Step 2: Convert to fraction form
    120,842.52/180,972.12 = 72,672.60/x
  3. Step 3: Cross multiply
    120,842.52x = 180,972.12 × 72,672.60
  4. Step 4: Simplify right side
    120,842.52x = 13,151,714,487.91
  5. Step 5: Solve for x
    x = 13,151,714,487.91/120,842.52
  6. Step 6: Final answer
    x = 108,833.50

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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.