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Finding the Fourth Proportional to 166.72, 230 and 155

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Solution

The fourth proportional to 166.72, 230 and 155 is: 213.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.72 : 230 = 155 : x
  2. Step 2: Convert to fraction form
    166.72/230 = 155/x
  3. Step 3: Cross multiply
    166.72x = 230 × 155
  4. Step 4: Simplify right side
    166.72x = 35,650
  5. Step 5: Solve for x
    x = 35,650/166.72
  6. Step 6: Final answer
    x = 213.83

Related Problems

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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.