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Finding the Fourth Proportional to 661.46, 912.92 and 413.05

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Solution

The fourth proportional to 661.46, 912.92 and 413.05 is: 570.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.46 : 912.92 = 413.05 : x
  2. Step 2: Convert to fraction form
    661.46/912.92 = 413.05/x
  3. Step 3: Cross multiply
    661.46x = 912.92 × 413.05
  4. Step 4: Simplify right side
    661.46x = 377,081.61
  5. Step 5: Solve for x
    x = 377,081.61/661.46
  6. Step 6: Final answer
    x = 570.07

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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.