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Finding the Fourth Proportional to 742.80, 1,025.03 and 480.96

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Solution

The fourth proportional to 742.80, 1,025.03 and 480.96 is: 663.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.80 : 1,025.03 = 480.96 : x
  2. Step 2: Convert to fraction form
    742.80/1,025.03 = 480.96/x
  3. Step 3: Cross multiply
    742.80x = 1,025.03 × 480.96
  4. Step 4: Simplify right side
    742.80x = 492,996.02
  5. Step 5: Solve for x
    x = 492,996.02/742.80
  6. Step 6: Final answer
    x = 663.70

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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.