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Finding the Fourth Proportional to 728.65, 1,005.66 and 413.93

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Solution

The fourth proportional to 728.65, 1,005.66 and 413.93 is: 571.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.65 : 1,005.66 = 413.93 : x
  2. Step 2: Convert to fraction form
    728.65/1,005.66 = 413.93/x
  3. Step 3: Cross multiply
    728.65x = 1,005.66 × 413.93
  4. Step 4: Simplify right side
    728.65x = 416,272.84
  5. Step 5: Solve for x
    x = 416,272.84/728.65
  6. Step 6: Final answer
    x = 571.29

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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.