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Finding the Fourth Proportional to 661.90, 913.85 and 413.56

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Solution

The fourth proportional to 661.90, 913.85 and 413.56 is: 570.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.90 : 913.85 = 413.56 : x
  2. Step 2: Convert to fraction form
    661.90/913.85 = 413.56/x
  3. Step 3: Cross multiply
    661.90x = 913.85 × 413.56
  4. Step 4: Simplify right side
    661.90x = 377,929.74
  5. Step 5: Solve for x
    x = 377,929.74/661.90
  6. Step 6: Final answer
    x = 570.98

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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.