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Finding the Fourth Proportional to 915.28, 1,371.64 and 793.24

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Solution

The fourth proportional to 915.28, 1,371.64 and 793.24 is: 1,188.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.28 : 1,371.64 = 793.24 : x
  2. Step 2: Convert to fraction form
    915.28/1,371.64 = 793.24/x
  3. Step 3: Cross multiply
    915.28x = 1,371.64 × 793.24
  4. Step 4: Simplify right side
    915.28x = 1,088,039.71
  5. Step 5: Solve for x
    x = 1,088,039.71/915.28
  6. Step 6: Final answer
    x = 1,188.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.