Home / 155.20-231.30-148.40

Finding the Fourth Proportional to 155.20, 231.30 and 148.40

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Solution

The fourth proportional to 155.20, 231.30 and 148.40 is: 221.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.20 : 231.30 = 148.40 : x
  2. Step 2: Convert to fraction form
    155.20/231.30 = 148.40/x
  3. Step 3: Cross multiply
    155.20x = 231.30 × 148.40
  4. Step 4: Simplify right side
    155.20x = 34,324.92
  5. Step 5: Solve for x
    x = 34,324.92/155.20
  6. Step 6: Final answer
    x = 221.17

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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.