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Finding the Fourth Proportional to 211.00, 291.20 and 117.75

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Solution

The fourth proportional to 211.00, 291.20 and 117.75 is: 162.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.00 : 291.20 = 117.75 : x
  2. Step 2: Convert to fraction form
    211.00/291.20 = 117.75/x
  3. Step 3: Cross multiply
    211.00x = 291.20 × 117.75
  4. Step 4: Simplify right side
    211.00x = 34,286.85
  5. Step 5: Solve for x
    x = 34,286.85/211.00
  6. Step 6: Final answer
    x = 162.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.