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Finding the Fourth Proportional to 728.89, 1,005.89 and 414.11

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Solution

The fourth proportional to 728.89, 1,005.89 and 414.11 is: 571.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.89 : 1,005.89 = 414.11 : x
  2. Step 2: Convert to fraction form
    728.89/1,005.89 = 414.11/x
  3. Step 3: Cross multiply
    728.89x = 1,005.89 × 414.11
  4. Step 4: Simplify right side
    728.89x = 416,549.55
  5. Step 5: Solve for x
    x = 416,549.55/728.89
  6. Step 6: Final answer
    x = 571.49

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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.