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Finding the Fourth Proportional to 141.35, 212.09 and 72.90

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Solution

The fourth proportional to 141.35, 212.09 and 72.90 is: 109.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.35 : 212.09 = 72.90 : x
  2. Step 2: Convert to fraction form
    141.35/212.09 = 72.90/x
  3. Step 3: Cross multiply
    141.35x = 212.09 × 72.90
  4. Step 4: Simplify right side
    141.35x = 15,461.00
  5. Step 5: Solve for x
    x = 15,461.00/141.35
  6. Step 6: Final answer
    x = 109.38

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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.