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Finding the Fourth Proportional to 211.80, 317.42 and 89.92

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Solution

The fourth proportional to 211.80, 317.42 and 89.92 is: 134.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.80 : 317.42 = 89.92 : x
  2. Step 2: Convert to fraction form
    211.80/317.42 = 89.92/x
  3. Step 3: Cross multiply
    211.80x = 317.42 × 89.92
  4. Step 4: Simplify right side
    211.80x = 28,542.41
  5. Step 5: Solve for x
    x = 28,542.41/211.80
  6. Step 6: Final answer
    x = 134.76

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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.