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Finding the Fourth Proportional to 474.92, 655.43 and 278.39

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Solution

The fourth proportional to 474.92, 655.43 and 278.39 is: 384.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.92 : 655.43 = 278.39 : x
  2. Step 2: Convert to fraction form
    474.92/655.43 = 278.39/x
  3. Step 3: Cross multiply
    474.92x = 655.43 × 278.39
  4. Step 4: Simplify right side
    474.92x = 182,465.16
  5. Step 5: Solve for x
    x = 182,465.16/474.92
  6. Step 6: Final answer
    x = 384.20

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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.