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Finding the Fourth Proportional to 993.18, 1,490.25 and 408.61

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Solution

The fourth proportional to 993.18, 1,490.25 and 408.61 is: 613.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.18 : 1,490.25 = 408.61 : x
  2. Step 2: Convert to fraction form
    993.18/1,490.25 = 408.61/x
  3. Step 3: Cross multiply
    993.18x = 1,490.25 × 408.61
  4. Step 4: Simplify right side
    993.18x = 608,934.78
  5. Step 5: Solve for x
    x = 608,934.78/993.18
  6. Step 6: Final answer
    x = 613.12

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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.