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Finding the Fourth Proportional to 993.86, 1,490.21 and 665.17

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Solution

The fourth proportional to 993.86, 1,490.21 and 665.17 is: 997.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.86 : 1,490.21 = 665.17 : x
  2. Step 2: Convert to fraction form
    993.86/1,490.21 = 665.17/x
  3. Step 3: Cross multiply
    993.86x = 1,490.21 × 665.17
  4. Step 4: Simplify right side
    993.86x = 991,244.02
  5. Step 5: Solve for x
    x = 991,244.02/993.86
  6. Step 6: Final answer
    x = 997.37

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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.