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Finding the Fourth Proportional to 153.10, 212.28 and 144.90

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Solution

The fourth proportional to 153.10, 212.28 and 144.90 is: 200.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.10 : 212.28 = 144.90 : x
  2. Step 2: Convert to fraction form
    153.10/212.28 = 144.90/x
  3. Step 3: Cross multiply
    153.10x = 212.28 × 144.90
  4. Step 4: Simplify right side
    153.10x = 30,758.83
  5. Step 5: Solve for x
    x = 30,758.83/153.10
  6. Step 6: Final answer
    x = 200.91

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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.