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Finding the Fourth Proportional to 661.20, 912.46 and 366.46

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Solution

The fourth proportional to 661.20, 912.46 and 366.46 is: 505.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.20 : 912.46 = 366.46 : x
  2. Step 2: Convert to fraction form
    661.20/912.46 = 366.46/x
  3. Step 3: Cross multiply
    661.20x = 912.46 × 366.46
  4. Step 4: Simplify right side
    661.20x = 334,376.89
  5. Step 5: Solve for x
    x = 334,376.89/661.20
  6. Step 6: Final answer
    x = 505.72

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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.