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Finding the Fourth Proportional to 763.38, 1,138.37 and 666.18

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Solution

The fourth proportional to 763.38, 1,138.37 and 666.18 is: 993.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.38 : 1,138.37 = 666.18 : x
  2. Step 2: Convert to fraction form
    763.38/1,138.37 = 666.18/x
  3. Step 3: Cross multiply
    763.38x = 1,138.37 × 666.18
  4. Step 4: Simplify right side
    763.38x = 758,356.00
  5. Step 5: Solve for x
    x = 758,356.00/763.38
  6. Step 6: Final answer
    x = 993.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.