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Finding the Fourth Proportional to 474.76, 655 and 288.32

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Solution

The fourth proportional to 474.76, 655 and 288.32 is: 397.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.76 : 655 = 288.32 : x
  2. Step 2: Convert to fraction form
    474.76/655 = 288.32/x
  3. Step 3: Cross multiply
    474.76x = 655 × 288.32
  4. Step 4: Simplify right side
    474.76x = 188,849.60
  5. Step 5: Solve for x
    x = 188,849.60/474.76
  6. Step 6: Final answer
    x = 397.78

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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.