Home / 12,387.97-18,585.40-4,990.70

Finding the Fourth Proportional to 12,387.97, 18,585.40 and 4,990.70

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Solution

The fourth proportional to 12,387.97, 18,585.40 and 4,990.70 is: 7,487.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,387.97 : 18,585.40 = 4,990.70 : x
  2. Step 2: Convert to fraction form
    12,387.97/18,585.40 = 4,990.70/x
  3. Step 3: Cross multiply
    12,387.97x = 18,585.40 × 4,990.70
  4. Step 4: Simplify right side
    12,387.97x = 92,754,155.78
  5. Step 5: Solve for x
    x = 92,754,155.78/12,387.97
  6. Step 6: Final answer
    x = 7,487.44

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Double scale
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Similar ratio
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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.