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Finding the Fourth Proportional to 728.64, 1,005.57 and 413.91

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Solution

The fourth proportional to 728.64, 1,005.57 and 413.91 is: 571.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.64 : 1,005.57 = 413.91 : x
  2. Step 2: Convert to fraction form
    728.64/1,005.57 = 413.91/x
  3. Step 3: Cross multiply
    728.64x = 1,005.57 × 413.91
  4. Step 4: Simplify right side
    728.64x = 416,215.48
  5. Step 5: Solve for x
    x = 416,215.48/728.64
  6. Step 6: Final answer
    x = 571.22

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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.