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Finding the Fourth Proportional to 1,000.89, 1,379.82 and 627.61

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Solution

The fourth proportional to 1,000.89, 1,379.82 and 627.61 is: 865.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.89 : 1,379.82 = 627.61 : x
  2. Step 2: Convert to fraction form
    1,000.89/1,379.82 = 627.61/x
  3. Step 3: Cross multiply
    1,000.89x = 1,379.82 × 627.61
  4. Step 4: Simplify right side
    1,000.89x = 865,988.83
  5. Step 5: Solve for x
    x = 865,988.83/1,000.89
  6. Step 6: Final answer
    x = 865.22

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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.