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Finding the Fourth Proportional to 915.54, 1,260.72 and 814.50

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Solution

The fourth proportional to 915.54, 1,260.72 and 814.50 is: 1,121.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.54 : 1,260.72 = 814.50 : x
  2. Step 2: Convert to fraction form
    915.54/1,260.72 = 814.50/x
  3. Step 3: Cross multiply
    915.54x = 1,260.72 × 814.50
  4. Step 4: Simplify right side
    915.54x = 1,026,856.44
  5. Step 5: Solve for x
    x = 1,026,856.44/915.54
  6. Step 6: Final answer
    x = 1,121.59

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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.