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Finding the Fourth Proportional to 915.58, 1,370.22 and 769.47

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Solution

The fourth proportional to 915.58, 1,370.22 and 769.47 is: 1,151.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.58 : 1,370.22 = 769.47 : x
  2. Step 2: Convert to fraction form
    915.58/1,370.22 = 769.47/x
  3. Step 3: Cross multiply
    915.58x = 1,370.22 × 769.47
  4. Step 4: Simplify right side
    915.58x = 1,054,343.18
  5. Step 5: Solve for x
    x = 1,054,343.18/915.58
  6. Step 6: Final answer
    x = 1,151.56

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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.