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Finding the Fourth Proportional to 211.19, 316.79 and 57.13

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Solution

The fourth proportional to 211.19, 316.79 and 57.13 is: 85.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.19 : 316.79 = 57.13 : x
  2. Step 2: Convert to fraction form
    211.19/316.79 = 57.13/x
  3. Step 3: Cross multiply
    211.19x = 316.79 × 57.13
  4. Step 4: Simplify right side
    211.19x = 18,098.08
  5. Step 5: Solve for x
    x = 18,098.08/211.19
  6. Step 6: Final answer
    x = 85.70

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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.