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Finding the Fourth Proportional to 178.52, 246.40 and 100.90

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Solution

The fourth proportional to 178.52, 246.40 and 100.90 is: 139.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.52 : 246.40 = 100.90 : x
  2. Step 2: Convert to fraction form
    178.52/246.40 = 100.90/x
  3. Step 3: Cross multiply
    178.52x = 246.40 × 100.90
  4. Step 4: Simplify right side
    178.52x = 24,860.98
  5. Step 5: Solve for x
    x = 24,860.98/178.52
  6. Step 6: Final answer
    x = 139.26

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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.