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Finding the Fourth Proportional to 475.76, 656.49 and 318.56

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Solution

The fourth proportional to 475.76, 656.49 and 318.56 is: 439.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.76 : 656.49 = 318.56 : x
  2. Step 2: Convert to fraction form
    475.76/656.49 = 318.56/x
  3. Step 3: Cross multiply
    475.76x = 656.49 × 318.56
  4. Step 4: Simplify right side
    475.76x = 209,133.10
  5. Step 5: Solve for x
    x = 209,133.10/475.76
  6. Step 6: Final answer
    x = 439.58

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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.