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Finding the Fourth Proportional to 657.42, 987 and 413.16

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Solution

The fourth proportional to 657.42, 987 and 413.16 is: 620.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.42 : 987 = 413.16 : x
  2. Step 2: Convert to fraction form
    657.42/987 = 413.16/x
  3. Step 3: Cross multiply
    657.42x = 987 × 413.16
  4. Step 4: Simplify right side
    657.42x = 407,788.92
  5. Step 5: Solve for x
    x = 407,788.92/657.42
  6. Step 6: Final answer
    x = 620.29

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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.