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Finding the Fourth Proportional to 153.85, 230.87 and 71.57

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Solution

The fourth proportional to 153.85, 230.87 and 71.57 is: 107.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.85 : 230.87 = 71.57 : x
  2. Step 2: Convert to fraction form
    153.85/230.87 = 71.57/x
  3. Step 3: Cross multiply
    153.85x = 230.87 × 71.57
  4. Step 4: Simplify right side
    153.85x = 16,523.37
  5. Step 5: Solve for x
    x = 16,523.37/153.85
  6. Step 6: Final answer
    x = 107.40

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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.