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Finding the Fourth Proportional to 915.55, 1,370.90 and 481.80

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Solution

The fourth proportional to 915.55, 1,370.90 and 481.80 is: 721.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.55 : 1,370.90 = 481.80 : x
  2. Step 2: Convert to fraction form
    915.55/1,370.90 = 481.80/x
  3. Step 3: Cross multiply
    915.55x = 1,370.90 × 481.80
  4. Step 4: Simplify right side
    915.55x = 660,490.36
  5. Step 5: Solve for x
    x = 660,490.36/915.55
  6. Step 6: Final answer
    x = 721.41

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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.