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Finding the Fourth Proportional to 666.40, 918.96 and 542.56

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Solution

The fourth proportional to 666.40, 918.96 and 542.56 is: 748.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.40 : 918.96 = 542.56 : x
  2. Step 2: Convert to fraction form
    666.40/918.96 = 542.56/x
  3. Step 3: Cross multiply
    666.40x = 918.96 × 542.56
  4. Step 4: Simplify right side
    666.40x = 498,590.94
  5. Step 5: Solve for x
    x = 498,590.94/666.40
  6. Step 6: Final answer
    x = 748.19

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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.