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Finding the Fourth Proportional to 964.28, 1,330.80 and 615.68

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Solution

The fourth proportional to 964.28, 1,330.80 and 615.68 is: 849.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.28 : 1,330.80 = 615.68 : x
  2. Step 2: Convert to fraction form
    964.28/1,330.80 = 615.68/x
  3. Step 3: Cross multiply
    964.28x = 1,330.80 × 615.68
  4. Step 4: Simplify right side
    964.28x = 819,346.94
  5. Step 5: Solve for x
    x = 819,346.94/964.28
  6. Step 6: Final answer
    x = 849.70

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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.