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Finding the Fourth Proportional to 661.43, 912.80 and 366.70

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Solution

The fourth proportional to 661.43, 912.80 and 366.70 is: 506.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.43 : 912.80 = 366.70 : x
  2. Step 2: Convert to fraction form
    661.43/912.80 = 366.70/x
  3. Step 3: Cross multiply
    661.43x = 912.80 × 366.70
  4. Step 4: Simplify right side
    661.43x = 334,719.20
  5. Step 5: Solve for x
    x = 334,719.20/661.43
  6. Step 6: Final answer
    x = 506.05

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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.