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Finding the Fourth Proportional to 155.79, 213.30 and 154.17

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Solution

The fourth proportional to 155.79, 213.30 and 154.17 is: 211.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.79 : 213.30 = 154.17 : x
  2. Step 2: Convert to fraction form
    155.79/213.30 = 154.17/x
  3. Step 3: Cross multiply
    155.79x = 213.30 × 154.17
  4. Step 4: Simplify right side
    155.79x = 32,884.46
  5. Step 5: Solve for x
    x = 32,884.46/155.79
  6. Step 6: Final answer
    x = 211.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.