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Finding the Fourth Proportional to 141.98, 212.90 and 55.31

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Solution

The fourth proportional to 141.98, 212.90 and 55.31 is: 82.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.98 : 212.90 = 55.31 : x
  2. Step 2: Convert to fraction form
    141.98/212.90 = 55.31/x
  3. Step 3: Cross multiply
    141.98x = 212.90 × 55.31
  4. Step 4: Simplify right side
    141.98x = 11,774.16
  5. Step 5: Solve for x
    x = 11,774.16/141.98
  6. Step 6: Final answer
    x = 82.93

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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.