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Finding the Fourth Proportional to 311.70, 430.18 and 180.76

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Solution

The fourth proportional to 311.70, 430.18 and 180.76 is: 249.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.70 : 430.18 = 180.76 : x
  2. Step 2: Convert to fraction form
    311.70/430.18 = 180.76/x
  3. Step 3: Cross multiply
    311.70x = 430.18 × 180.76
  4. Step 4: Simplify right side
    311.70x = 77,759.34
  5. Step 5: Solve for x
    x = 77,759.34/311.70
  6. Step 6: Final answer
    x = 249.47

Related Problems

Find fourth proportional to 155.85, 215.09 and 90.38
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Double scale
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1.5x scale

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.