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Finding the Fourth Proportional to 1,008.65, 1,512.61 and 391.91

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Solution

The fourth proportional to 1,008.65, 1,512.61 and 391.91 is: 587.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.65 : 1,512.61 = 391.91 : x
  2. Step 2: Convert to fraction form
    1,008.65/1,512.61 = 391.91/x
  3. Step 3: Cross multiply
    1,008.65x = 1,512.61 × 391.91
  4. Step 4: Simplify right side
    1,008.65x = 592,798.44
  5. Step 5: Solve for x
    x = 592,798.44/1,008.65
  6. Step 6: Final answer
    x = 587.71

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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.