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Finding the Fourth Proportional to 160.78, 242.03 and 138.46

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Solution

The fourth proportional to 160.78, 242.03 and 138.46 is: 208.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.78 : 242.03 = 138.46 : x
  2. Step 2: Convert to fraction form
    160.78/242.03 = 138.46/x
  3. Step 3: Cross multiply
    160.78x = 242.03 × 138.46
  4. Step 4: Simplify right side
    160.78x = 33,510.26
  5. Step 5: Solve for x
    x = 33,510.26/160.78
  6. Step 6: Final answer
    x = 208.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.