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Finding the Fourth Proportional to 178.38, 246.17 and 99.70

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Solution

The fourth proportional to 178.38, 246.17 and 99.70 is: 137.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.38 : 246.17 = 99.70 : x
  2. Step 2: Convert to fraction form
    178.38/246.17 = 99.70/x
  3. Step 3: Cross multiply
    178.38x = 246.17 × 99.70
  4. Step 4: Simplify right side
    178.38x = 24,541.84
  5. Step 5: Solve for x
    x = 24,541.84/178.38
  6. Step 6: Final answer
    x = 137.58

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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.