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Finding the Fourth Proportional to 385.20, 577.92 and 179.76

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Solution

The fourth proportional to 385.20, 577.92 and 179.76 is: 269.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.20 : 577.92 = 179.76 : x
  2. Step 2: Convert to fraction form
    385.20/577.92 = 179.76/x
  3. Step 3: Cross multiply
    385.20x = 577.92 × 179.76
  4. Step 4: Simplify right side
    385.20x = 103,886.90
  5. Step 5: Solve for x
    x = 103,886.90/385.20
  6. Step 6: Final answer
    x = 269.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.