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Finding the Fourth Proportional to 475.80, 656.40 and 279.28

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Solution

The fourth proportional to 475.80, 656.40 and 279.28 is: 385.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.80 : 656.40 = 279.28 : x
  2. Step 2: Convert to fraction form
    475.80/656.40 = 279.28/x
  3. Step 3: Cross multiply
    475.80x = 656.40 × 279.28
  4. Step 4: Simplify right side
    475.80x = 183,319.39
  5. Step 5: Solve for x
    x = 183,319.39/475.80
  6. Step 6: Final answer
    x = 385.29

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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.