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Finding the Fourth Proportional to 211.55, 317.28 and 57.49

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Solution

The fourth proportional to 211.55, 317.28 and 57.49 is: 86.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.55 : 317.28 = 57.49 : x
  2. Step 2: Convert to fraction form
    211.55/317.28 = 57.49/x
  3. Step 3: Cross multiply
    211.55x = 317.28 × 57.49
  4. Step 4: Simplify right side
    211.55x = 18,239.63
  5. Step 5: Solve for x
    x = 18,239.63/211.55
  6. Step 6: Final answer
    x = 86.22

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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.