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Finding the Fourth Proportional to 141.84, 212.67 and 69.78

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Solution

The fourth proportional to 141.84, 212.67 and 69.78 is: 104.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.84 : 212.67 = 69.78 : x
  2. Step 2: Convert to fraction form
    141.84/212.67 = 69.78/x
  3. Step 3: Cross multiply
    141.84x = 212.67 × 69.78
  4. Step 4: Simplify right side
    141.84x = 14,840.11
  5. Step 5: Solve for x
    x = 14,840.11/141.84
  6. Step 6: Final answer
    x = 104.63

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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.