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Finding the Fourth Proportional to 156.65, 217.67 and 154.71

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Solution

The fourth proportional to 156.65, 217.67 and 154.71 is: 214.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.65 : 217.67 = 154.71 : x
  2. Step 2: Convert to fraction form
    156.65/217.67 = 154.71/x
  3. Step 3: Cross multiply
    156.65x = 217.67 × 154.71
  4. Step 4: Simplify right side
    156.65x = 33,675.34
  5. Step 5: Solve for x
    x = 33,675.34/156.65
  6. Step 6: Final answer
    x = 214.97

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.