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Finding the Fourth Proportional to 153.90, 231.05 and 146.81

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Solution

The fourth proportional to 153.90, 231.05 and 146.81 is: 220.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.90 : 231.05 = 146.81 : x
  2. Step 2: Convert to fraction form
    153.90/231.05 = 146.81/x
  3. Step 3: Cross multiply
    153.90x = 231.05 × 146.81
  4. Step 4: Simplify right side
    153.90x = 33,921.40
  5. Step 5: Solve for x
    x = 33,921.40/153.90
  6. Step 6: Final answer
    x = 220.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.