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Finding the Fourth Proportional to 80,643.20, 120,820.80 and 38,998.40

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Solution

The fourth proportional to 80,643.20, 120,820.80 and 38,998.40 is: 58,427.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,643.20 : 120,820.80 = 38,998.40 : x
  2. Step 2: Convert to fraction form
    80,643.20/120,820.80 = 38,998.40/x
  3. Step 3: Cross multiply
    80,643.20x = 120,820.80 × 38,998.40
  4. Step 4: Simplify right side
    80,643.20x = 4,711,817,886.72
  5. Step 5: Solve for x
    x = 4,711,817,886.72/80,643.20
  6. Step 6: Final answer
    x = 58,427.96

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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.