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Finding the Fourth Proportional to 661.68, 913.37 and 413.19

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Solution

The fourth proportional to 661.68, 913.37 and 413.19 is: 570.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.68 : 913.37 = 413.19 : x
  2. Step 2: Convert to fraction form
    661.68/913.37 = 413.19/x
  3. Step 3: Cross multiply
    661.68x = 913.37 × 413.19
  4. Step 4: Simplify right side
    661.68x = 377,393.28
  5. Step 5: Solve for x
    x = 377,393.28/661.68
  6. Step 6: Final answer
    x = 570.36

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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.