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Finding the Fourth Proportional to 179.48, 247.68 and 100.80

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Solution

The fourth proportional to 179.48, 247.68 and 100.80 is: 139.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.48 : 247.68 = 100.80 : x
  2. Step 2: Convert to fraction form
    179.48/247.68 = 100.80/x
  3. Step 3: Cross multiply
    179.48x = 247.68 × 100.80
  4. Step 4: Simplify right side
    179.48x = 24,966.14
  5. Step 5: Solve for x
    x = 24,966.14/179.48
  6. Step 6: Final answer
    x = 139.10

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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.