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Finding the Fourth Proportional to 153.03, 211.19 and 111.81

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Solution

The fourth proportional to 153.03, 211.19 and 111.81 is: 154.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.03 : 211.19 = 111.81 : x
  2. Step 2: Convert to fraction form
    153.03/211.19 = 111.81/x
  3. Step 3: Cross multiply
    153.03x = 211.19 × 111.81
  4. Step 4: Simplify right side
    153.03x = 23,612.59
  5. Step 5: Solve for x
    x = 23,612.59/153.03
  6. Step 6: Final answer
    x = 154.30

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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.