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Finding the Fourth Proportional to 478.28, 660 and 279.11

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Solution

The fourth proportional to 478.28, 660 and 279.11 is: 385.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.28 : 660 = 279.11 : x
  2. Step 2: Convert to fraction form
    478.28/660 = 279.11/x
  3. Step 3: Cross multiply
    478.28x = 660 × 279.11
  4. Step 4: Simplify right side
    478.28x = 184,209.30
  5. Step 5: Solve for x
    x = 184,209.30/478.28
  6. Step 6: Final answer
    x = 385.15

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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.