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Finding the Fourth Proportional to 211.95, 318.08 and 75.00

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Solution

The fourth proportional to 211.95, 318.08 and 75.00 is: 112.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.95 : 318.08 = 75.00 : x
  2. Step 2: Convert to fraction form
    211.95/318.08 = 75.00/x
  3. Step 3: Cross multiply
    211.95x = 318.08 × 75.00
  4. Step 4: Simplify right side
    211.95x = 23,857.38
  5. Step 5: Solve for x
    x = 23,857.38/211.95
  6. Step 6: Final answer
    x = 112.56

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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.