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Finding the Fourth Proportional to 80,487.40, 120,731.10 and 21,332.20

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Solution

The fourth proportional to 80,487.40, 120,731.10 and 21,332.20 is: 31,998.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,487.40 : 120,731.10 = 21,332.20 : x
  2. Step 2: Convert to fraction form
    80,487.40/120,731.10 = 21,332.20/x
  3. Step 3: Cross multiply
    80,487.40x = 120,731.10 × 21,332.20
  4. Step 4: Simplify right side
    80,487.40x = 2,575,459,971.42
  5. Step 5: Solve for x
    x = 2,575,459,971.42/80,487.40
  6. Step 6: Final answer
    x = 31,998.30

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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.