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Finding the Fourth Proportional to 178.18, 245.90 and 100.55

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Solution

The fourth proportional to 178.18, 245.90 and 100.55 is: 138.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.18 : 245.90 = 100.55 : x
  2. Step 2: Convert to fraction form
    178.18/245.90 = 100.55/x
  3. Step 3: Cross multiply
    178.18x = 245.90 × 100.55
  4. Step 4: Simplify right side
    178.18x = 24,725.25
  5. Step 5: Solve for x
    x = 24,725.25/178.18
  6. Step 6: Final answer
    x = 138.77

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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.