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Finding the Fourth Proportional to 742.90, 1,025.19 and 411.33

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Solution

The fourth proportional to 742.90, 1,025.19 and 411.33 is: 567.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.90 : 1,025.19 = 411.33 : x
  2. Step 2: Convert to fraction form
    742.90/1,025.19 = 411.33/x
  3. Step 3: Cross multiply
    742.90x = 1,025.19 × 411.33
  4. Step 4: Simplify right side
    742.90x = 421,691.40
  5. Step 5: Solve for x
    x = 421,691.40/742.90
  6. Step 6: Final answer
    x = 567.63

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Double scale
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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.