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Finding the Fourth Proportional to 661.61, 913.04 and 366.90

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Solution

The fourth proportional to 661.61, 913.04 and 366.90 is: 506.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.61 : 913.04 = 366.90 : x
  2. Step 2: Convert to fraction form
    661.61/913.04 = 366.90/x
  3. Step 3: Cross multiply
    661.61x = 913.04 × 366.90
  4. Step 4: Simplify right side
    661.61x = 334,992.54
  5. Step 5: Solve for x
    x = 334,992.54/661.61
  6. Step 6: Final answer
    x = 506.33

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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.