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Finding the Fourth Proportional to 669.78, 924.17 and 404.15

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Solution

The fourth proportional to 669.78, 924.17 and 404.15 is: 557.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.78 : 924.17 = 404.15 : x
  2. Step 2: Convert to fraction form
    669.78/924.17 = 404.15/x
  3. Step 3: Cross multiply
    669.78x = 924.17 × 404.15
  4. Step 4: Simplify right side
    669.78x = 373,496.66
  5. Step 5: Solve for x
    x = 373,496.66/669.78
  6. Step 6: Final answer
    x = 557.64

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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.