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Finding the Fourth Proportional to 211.01, 316.55 and 89.28

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Solution

The fourth proportional to 211.01, 316.55 and 89.28 is: 133.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.01 : 316.55 = 89.28 : x
  2. Step 2: Convert to fraction form
    211.01/316.55 = 89.28/x
  3. Step 3: Cross multiply
    211.01x = 316.55 × 89.28
  4. Step 4: Simplify right side
    211.01x = 28,260.73
  5. Step 5: Solve for x
    x = 28,260.73/211.01
  6. Step 6: Final answer
    x = 133.93

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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.