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Finding the Fourth Proportional to 211.28, 316.91 and 89.57

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Solution

The fourth proportional to 211.28, 316.91 and 89.57 is: 134.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.28 : 316.91 = 89.57 : x
  2. Step 2: Convert to fraction form
    211.28/316.91 = 89.57/x
  3. Step 3: Cross multiply
    211.28x = 316.91 × 89.57
  4. Step 4: Simplify right side
    211.28x = 28,386.64
  5. Step 5: Solve for x
    x = 28,386.64/211.28
  6. Step 6: Final answer
    x = 134.36

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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.