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Finding the Fourth Proportional to 661.49, 912.85 and 358.66

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Solution

The fourth proportional to 661.49, 912.85 and 358.66 is: 494.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.49 : 912.85 = 358.66 : x
  2. Step 2: Convert to fraction form
    661.49/912.85 = 358.66/x
  3. Step 3: Cross multiply
    661.49x = 912.85 × 358.66
  4. Step 4: Simplify right side
    661.49x = 327,405.04
  5. Step 5: Solve for x
    x = 327,405.04/661.49
  6. Step 6: Final answer
    x = 494.95

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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.