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Finding the Fourth Proportional to 912.22, 1,258.66 and 580.44

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Solution

The fourth proportional to 912.22, 1,258.66 and 580.44 is: 800.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.22 : 1,258.66 = 580.44 : x
  2. Step 2: Convert to fraction form
    912.22/1,258.66 = 580.44/x
  3. Step 3: Cross multiply
    912.22x = 1,258.66 × 580.44
  4. Step 4: Simplify right side
    912.22x = 730,576.61
  5. Step 5: Solve for x
    x = 730,576.61/912.22
  6. Step 6: Final answer
    x = 800.88

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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.