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Finding the Fourth Proportional to 915.52, 1,366.64 and 851.43

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Solution

The fourth proportional to 915.52, 1,366.64 and 851.43 is: 1,270.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.52 : 1,366.64 = 851.43 : x
  2. Step 2: Convert to fraction form
    915.52/1,366.64 = 851.43/x
  3. Step 3: Cross multiply
    915.52x = 1,366.64 × 851.43
  4. Step 4: Simplify right side
    915.52x = 1,163,598.30
  5. Step 5: Solve for x
    x = 1,163,598.30/915.52
  6. Step 6: Final answer
    x = 1,270.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.