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Finding the Fourth Proportional to 139.96, 210 and 91.88

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Solution

The fourth proportional to 139.96, 210 and 91.88 is: 137.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.96 : 210 = 91.88 : x
  2. Step 2: Convert to fraction form
    139.96/210 = 91.88/x
  3. Step 3: Cross multiply
    139.96x = 210 × 91.88
  4. Step 4: Simplify right side
    139.96x = 19,294.80
  5. Step 5: Solve for x
    x = 19,294.80/139.96
  6. Step 6: Final answer
    x = 137.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.