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Finding the Fourth Proportional to 120,000.40, 180,000.60 and 72,761.20

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Solution

The fourth proportional to 120,000.40, 180,000.60 and 72,761.20 is: 109,141.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,000.40 : 180,000.60 = 72,761.20 : x
  2. Step 2: Convert to fraction form
    120,000.40/180,000.60 = 72,761.20/x
  3. Step 3: Cross multiply
    120,000.40x = 180,000.60 × 72,761.20
  4. Step 4: Simplify right side
    120,000.40x = 13,097,059,656.72
  5. Step 5: Solve for x
    x = 13,097,059,656.72/120,000.40
  6. Step 6: Final answer
    x = 109,141.80

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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.