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Finding the Fourth Proportional to 728.58, 1,005.47 and 413.88

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Solution

The fourth proportional to 728.58, 1,005.47 and 413.88 is: 571.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.58 : 1,005.47 = 413.88 : x
  2. Step 2: Convert to fraction form
    728.58/1,005.47 = 413.88/x
  3. Step 3: Cross multiply
    728.58x = 1,005.47 × 413.88
  4. Step 4: Simplify right side
    728.58x = 416,143.92
  5. Step 5: Solve for x
    x = 416,143.92/728.58
  6. Step 6: Final answer
    x = 571.17

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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.