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Finding the Fourth Proportional to 141.47, 212.21 and 45.29

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Solution

The fourth proportional to 141.47, 212.21 and 45.29 is: 67.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.47 : 212.21 = 45.29 : x
  2. Step 2: Convert to fraction form
    141.47/212.21 = 45.29/x
  3. Step 3: Cross multiply
    141.47x = 212.21 × 45.29
  4. Step 4: Simplify right side
    141.47x = 9,610.99
  5. Step 5: Solve for x
    x = 9,610.99/141.47
  6. Step 6: Final answer
    x = 67.94

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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.