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Finding the Fourth Proportional to 742.78, 1,025.10 and 411.25

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Solution

The fourth proportional to 742.78, 1,025.10 and 411.25 is: 567.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.78 : 1,025.10 = 411.25 : x
  2. Step 2: Convert to fraction form
    742.78/1,025.10 = 411.25/x
  3. Step 3: Cross multiply
    742.78x = 1,025.10 × 411.25
  4. Step 4: Simplify right side
    742.78x = 421,572.38
  5. Step 5: Solve for x
    x = 421,572.38/742.78
  6. Step 6: Final answer
    x = 567.56

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Half scale
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Double scale
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1.5x scale

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.