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Finding the Fourth Proportional to 742.82, 1,024.40 and 480.38

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Solution

The fourth proportional to 742.82, 1,024.40 and 480.38 is: 662.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.82 : 1,024.40 = 480.38 : x
  2. Step 2: Convert to fraction form
    742.82/1,024.40 = 480.38/x
  3. Step 3: Cross multiply
    742.82x = 1,024.40 × 480.38
  4. Step 4: Simplify right side
    742.82x = 492,098.87
  5. Step 5: Solve for x
    x = 492,098.87/742.82
  6. Step 6: Final answer
    x = 662.47

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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.