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Finding the Fourth Proportional to 666.74, 920.16 and 404.90

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Solution

The fourth proportional to 666.74, 920.16 and 404.90 is: 558.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.74 : 920.16 = 404.90 : x
  2. Step 2: Convert to fraction form
    666.74/920.16 = 404.90/x
  3. Step 3: Cross multiply
    666.74x = 920.16 × 404.90
  4. Step 4: Simplify right side
    666.74x = 372,572.78
  5. Step 5: Solve for x
    x = 372,572.78/666.74
  6. Step 6: Final answer
    x = 558.80

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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.