Home / 1,487.46-2,231.12-621.78

Finding the Fourth Proportional to 1,487.46, 2,231.12 and 621.78

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Solution

The fourth proportional to 1,487.46, 2,231.12 and 621.78 is: 932.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.46 : 2,231.12 = 621.78 : x
  2. Step 2: Convert to fraction form
    1,487.46/2,231.12 = 621.78/x
  3. Step 3: Cross multiply
    1,487.46x = 2,231.12 × 621.78
  4. Step 4: Simplify right side
    1,487.46x = 1,387,257.23
  5. Step 5: Solve for x
    x = 1,387,257.23/1,487.46
  6. Step 6: Final answer
    x = 932.63

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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.