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Finding the Fourth Proportional to 141.36, 211.76 and 72.80

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Solution

The fourth proportional to 141.36, 211.76 and 72.80 is: 109.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.36 : 211.76 = 72.80 : x
  2. Step 2: Convert to fraction form
    141.36/211.76 = 72.80/x
  3. Step 3: Cross multiply
    141.36x = 211.76 × 72.80
  4. Step 4: Simplify right side
    141.36x = 15,416.13
  5. Step 5: Solve for x
    x = 15,416.13/141.36
  6. Step 6: Final answer
    x = 109.06

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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.