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Finding the Fourth Proportional to 613.78, 921.48 and 354.04

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Solution

The fourth proportional to 613.78, 921.48 and 354.04 is: 531.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.78 : 921.48 = 354.04 : x
  2. Step 2: Convert to fraction form
    613.78/921.48 = 354.04/x
  3. Step 3: Cross multiply
    613.78x = 921.48 × 354.04
  4. Step 4: Simplify right side
    613.78x = 326,240.78
  5. Step 5: Solve for x
    x = 326,240.78/613.78
  6. Step 6: Final answer
    x = 531.53

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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.