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Finding the Fourth Proportional to 178.05, 245.70 and 100.43

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Solution

The fourth proportional to 178.05, 245.70 and 100.43 is: 138.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.05 : 245.70 = 100.43 : x
  2. Step 2: Convert to fraction form
    178.05/245.70 = 100.43/x
  3. Step 3: Cross multiply
    178.05x = 245.70 × 100.43
  4. Step 4: Simplify right side
    178.05x = 24,675.65
  5. Step 5: Solve for x
    x = 24,675.65/178.05
  6. Step 6: Final answer
    x = 138.59

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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.