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Finding the Fourth Proportional to 474.78, 655.30 and 308.70

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Solution

The fourth proportional to 474.78, 655.30 and 308.70 is: 426.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.78 : 655.30 = 308.70 : x
  2. Step 2: Convert to fraction form
    474.78/655.30 = 308.70/x
  3. Step 3: Cross multiply
    474.78x = 655.30 × 308.70
  4. Step 4: Simplify right side
    474.78x = 202,294.21
  5. Step 5: Solve for x
    x = 202,294.21/474.78
  6. Step 6: Final answer
    x = 426.08

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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.