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Finding the Fourth Proportional to 153.40, 211.57 and 111.82

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Solution

The fourth proportional to 153.40, 211.57 and 111.82 is: 154.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.40 : 211.57 = 111.82 : x
  2. Step 2: Convert to fraction form
    153.40/211.57 = 111.82/x
  3. Step 3: Cross multiply
    153.40x = 211.57 × 111.82
  4. Step 4: Simplify right side
    153.40x = 23,657.76
  5. Step 5: Solve for x
    x = 23,657.76/153.40
  6. Step 6: Final answer
    x = 154.22

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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.