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Finding the Fourth Proportional to 141.30, 211.81 and 89.79

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Solution

The fourth proportional to 141.30, 211.81 and 89.79 is: 134.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.30 : 211.81 = 89.79 : x
  2. Step 2: Convert to fraction form
    141.30/211.81 = 89.79/x
  3. Step 3: Cross multiply
    141.30x = 211.81 × 89.79
  4. Step 4: Simplify right side
    141.30x = 19,018.42
  5. Step 5: Solve for x
    x = 19,018.42/141.30
  6. Step 6: Final answer
    x = 134.60

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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.