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Finding the Fourth Proportional to 964.53, 1,328.67 and 915.12

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Solution

The fourth proportional to 964.53, 1,328.67 and 915.12 is: 1,260.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.53 : 1,328.67 = 915.12 : x
  2. Step 2: Convert to fraction form
    964.53/1,328.67 = 915.12/x
  3. Step 3: Cross multiply
    964.53x = 1,328.67 × 915.12
  4. Step 4: Simplify right side
    964.53x = 1,215,892.49
  5. Step 5: Solve for x
    x = 1,215,892.49/964.53
  6. Step 6: Final answer
    x = 1,260.61

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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.