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Finding the Fourth Proportional to 966.64, 1,440.76 and 911.96

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Solution

The fourth proportional to 966.64, 1,440.76 and 911.96 is: 1,359.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.64 : 1,440.76 = 911.96 : x
  2. Step 2: Convert to fraction form
    966.64/1,440.76 = 911.96/x
  3. Step 3: Cross multiply
    966.64x = 1,440.76 × 911.96
  4. Step 4: Simplify right side
    966.64x = 1,313,915.49
  5. Step 5: Solve for x
    x = 1,313,915.49/966.64
  6. Step 6: Final answer
    x = 1,359.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.