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Finding the Fourth Proportional to 153.69, 212.19 and 112.17

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Solution

The fourth proportional to 153.69, 212.19 and 112.17 is: 154.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.69 : 212.19 = 112.17 : x
  2. Step 2: Convert to fraction form
    153.69/212.19 = 112.17/x
  3. Step 3: Cross multiply
    153.69x = 212.19 × 112.17
  4. Step 4: Simplify right side
    153.69x = 23,801.35
  5. Step 5: Solve for x
    x = 23,801.35/153.69
  6. Step 6: Final answer
    x = 154.87

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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.