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Finding the Fourth Proportional to 162.78, 242.99 and 159.54

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Solution

The fourth proportional to 162.78, 242.99 and 159.54 is: 238.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.78 : 242.99 = 159.54 : x
  2. Step 2: Convert to fraction form
    162.78/242.99 = 159.54/x
  3. Step 3: Cross multiply
    162.78x = 242.99 × 159.54
  4. Step 4: Simplify right side
    162.78x = 38,765.83
  5. Step 5: Solve for x
    x = 38,765.83/162.78
  6. Step 6: Final answer
    x = 238.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.