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Finding the Fourth Proportional to 211.54, 316.99 and 89.86

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Solution

The fourth proportional to 211.54, 316.99 and 89.86 is: 134.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.54 : 316.99 = 89.86 : x
  2. Step 2: Convert to fraction form
    211.54/316.99 = 89.86/x
  3. Step 3: Cross multiply
    211.54x = 316.99 × 89.86
  4. Step 4: Simplify right side
    211.54x = 28,484.72
  5. Step 5: Solve for x
    x = 28,484.72/211.54
  6. Step 6: Final answer
    x = 134.65

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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.