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Finding the Fourth Proportional to 156.81, 217.86 and 154.89

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Solution

The fourth proportional to 156.81, 217.86 and 154.89 is: 215.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.81 : 217.86 = 154.89 : x
  2. Step 2: Convert to fraction form
    156.81/217.86 = 154.89/x
  3. Step 3: Cross multiply
    156.81x = 217.86 × 154.89
  4. Step 4: Simplify right side
    156.81x = 33,744.34
  5. Step 5: Solve for x
    x = 33,744.34/156.81
  6. Step 6: Final answer
    x = 215.19

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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.