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Finding the Fourth Proportional to 475.39, 656.05 and 278.90

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Solution

The fourth proportional to 475.39, 656.05 and 278.90 is: 384.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.39 : 656.05 = 278.90 : x
  2. Step 2: Convert to fraction form
    475.39/656.05 = 278.90/x
  3. Step 3: Cross multiply
    475.39x = 656.05 × 278.90
  4. Step 4: Simplify right side
    475.39x = 182,969.06
  5. Step 5: Solve for x
    x = 182,969.06/475.39
  6. Step 6: Final answer
    x = 384.89

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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.