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Finding the Fourth Proportional to 141.45, 212.15 and 45.26

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Solution

The fourth proportional to 141.45, 212.15 and 45.26 is: 67.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.45 : 212.15 = 45.26 : x
  2. Step 2: Convert to fraction form
    141.45/212.15 = 45.26/x
  3. Step 3: Cross multiply
    141.45x = 212.15 × 45.26
  4. Step 4: Simplify right side
    141.45x = 9,601.76
  5. Step 5: Solve for x
    x = 9,601.76/141.45
  6. Step 6: Final answer
    x = 67.88

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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.