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Finding the Fourth Proportional to 112,642.80, 155,260.44 and 80,761.20

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Solution

The fourth proportional to 112,642.80, 155,260.44 and 80,761.20 is: 111,316.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,642.80 : 155,260.44 = 80,761.20 : x
  2. Step 2: Convert to fraction form
    112,642.80/155,260.44 = 80,761.20/x
  3. Step 3: Cross multiply
    112,642.80x = 155,260.44 × 80,761.20
  4. Step 4: Simplify right side
    112,642.80x = 12,539,019,446.93
  5. Step 5: Solve for x
    x = 12,539,019,446.93/112,642.80
  6. Step 6: Final answer
    x = 111,316.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.