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Finding the Fourth Proportional to 475.76, 656.64 and 279.44

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Solution

The fourth proportional to 475.76, 656.64 and 279.44 is: 385.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.76 : 656.64 = 279.44 : x
  2. Step 2: Convert to fraction form
    475.76/656.64 = 279.44/x
  3. Step 3: Cross multiply
    475.76x = 656.64 × 279.44
  4. Step 4: Simplify right side
    475.76x = 183,491.48
  5. Step 5: Solve for x
    x = 183,491.48/475.76
  6. Step 6: Final answer
    x = 385.68

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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.