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Finding the Fourth Proportional to 964.38, 1,331.06 and 615

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Solution

The fourth proportional to 964.38, 1,331.06 and 615 is: 848.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.38 : 1,331.06 = 615 : x
  2. Step 2: Convert to fraction form
    964.38/1,331.06 = 615/x
  3. Step 3: Cross multiply
    964.38x = 1,331.06 × 615
  4. Step 4: Simplify right side
    964.38x = 818,601.90
  5. Step 5: Solve for x
    x = 818,601.90/964.38
  6. Step 6: Final answer
    x = 848.84

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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.