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Finding the Fourth Proportional to 993.16, 1,489.02 and 667.85

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Solution

The fourth proportional to 993.16, 1,489.02 and 667.85 is: 1,001.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.16 : 1,489.02 = 667.85 : x
  2. Step 2: Convert to fraction form
    993.16/1,489.02 = 667.85/x
  3. Step 3: Cross multiply
    993.16x = 1,489.02 × 667.85
  4. Step 4: Simplify right side
    993.16x = 994,432.06
  5. Step 5: Solve for x
    x = 994,432.06/993.16
  6. Step 6: Final answer
    x = 1,001.28

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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.