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Finding the Fourth Proportional to 155.46, 231.86 and 139.96

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Solution

The fourth proportional to 155.46, 231.86 and 139.96 is: 208.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.46 : 231.86 = 139.96 : x
  2. Step 2: Convert to fraction form
    155.46/231.86 = 139.96/x
  3. Step 3: Cross multiply
    155.46x = 231.86 × 139.96
  4. Step 4: Simplify right side
    155.46x = 32,451.13
  5. Step 5: Solve for x
    x = 32,451.13/155.46
  6. Step 6: Final answer
    x = 208.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.