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Finding the Fourth Proportional to 474.78, 655.20 and 278.31

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Solution

The fourth proportional to 474.78, 655.20 and 278.31 is: 384.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.78 : 655.20 = 278.31 : x
  2. Step 2: Convert to fraction form
    474.78/655.20 = 278.31/x
  3. Step 3: Cross multiply
    474.78x = 655.20 × 278.31
  4. Step 4: Simplify right side
    474.78x = 182,348.71
  5. Step 5: Solve for x
    x = 182,348.71/474.78
  6. Step 6: Final answer
    x = 384.07

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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.