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Finding the Fourth Proportional to 742.27, 1,025.15 and 494.64

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Solution

The fourth proportional to 742.27, 1,025.15 and 494.64 is: 683.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.27 : 1,025.15 = 494.64 : x
  2. Step 2: Convert to fraction form
    742.27/1,025.15 = 494.64/x
  3. Step 3: Cross multiply
    742.27x = 1,025.15 × 494.64
  4. Step 4: Simplify right side
    742.27x = 507,079.64
  5. Step 5: Solve for x
    x = 507,079.64/742.27
  6. Step 6: Final answer
    x = 683.15

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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.