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Finding the Fourth Proportional to 80,657.20, 120,841.80 and 39,012.40

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Solution

The fourth proportional to 80,657.20, 120,841.80 and 39,012.40 is: 58,448.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,657.20 : 120,841.80 = 39,012.40 : x
  2. Step 2: Convert to fraction form
    80,657.20/120,841.80 = 39,012.40/x
  3. Step 3: Cross multiply
    80,657.20x = 120,841.80 × 39,012.40
  4. Step 4: Simplify right side
    80,657.20x = 4,714,328,638.32
  5. Step 5: Solve for x
    x = 4,714,328,638.32/80,657.20
  6. Step 6: Final answer
    x = 58,448.95

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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.