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Finding the Fourth Proportional to 964.32, 1,330.28 and 571.20

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Solution

The fourth proportional to 964.32, 1,330.28 and 571.20 is: 787.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.32 : 1,330.28 = 571.20 : x
  2. Step 2: Convert to fraction form
    964.32/1,330.28 = 571.20/x
  3. Step 3: Cross multiply
    964.32x = 1,330.28 × 571.20
  4. Step 4: Simplify right side
    964.32x = 759,855.94
  5. Step 5: Solve for x
    x = 759,855.94/964.32
  6. Step 6: Final answer
    x = 787.97

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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.