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Finding the Fourth Proportional to 162.35, 243.54 and 139.80

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Solution

The fourth proportional to 162.35, 243.54 and 139.80 is: 209.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.35 : 243.54 = 139.80 : x
  2. Step 2: Convert to fraction form
    162.35/243.54 = 139.80/x
  3. Step 3: Cross multiply
    162.35x = 243.54 × 139.80
  4. Step 4: Simplify right side
    162.35x = 34,046.89
  5. Step 5: Solve for x
    x = 34,046.89/162.35
  6. Step 6: Final answer
    x = 209.72

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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.