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Finding the Fourth Proportional to 915.46, 1,375.93 and 806.11

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Solution

The fourth proportional to 915.46, 1,375.93 and 806.11 is: 1,211.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.46 : 1,375.93 = 806.11 : x
  2. Step 2: Convert to fraction form
    915.46/1,375.93 = 806.11/x
  3. Step 3: Cross multiply
    915.46x = 1,375.93 × 806.11
  4. Step 4: Simplify right side
    915.46x = 1,109,150.93
  5. Step 5: Solve for x
    x = 1,109,150.93/915.46
  6. Step 6: Final answer
    x = 1,211.58

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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.