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Finding the Fourth Proportional to 1,587.70, 2,382.45 and 613.87

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Solution

The fourth proportional to 1,587.70, 2,382.45 and 613.87 is: 921.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.70 : 2,382.45 = 613.87 : x
  2. Step 2: Convert to fraction form
    1,587.70/2,382.45 = 613.87/x
  3. Step 3: Cross multiply
    1,587.70x = 2,382.45 × 613.87
  4. Step 4: Simplify right side
    1,587.70x = 1,462,514.58
  5. Step 5: Solve for x
    x = 1,462,514.58/1,587.70
  6. Step 6: Final answer
    x = 921.15

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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.