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Finding the Fourth Proportional to 211.08, 291.28 and 117.80

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Solution

The fourth proportional to 211.08, 291.28 and 117.80 is: 162.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.08 : 291.28 = 117.80 : x
  2. Step 2: Convert to fraction form
    211.08/291.28 = 117.80/x
  3. Step 3: Cross multiply
    211.08x = 291.28 × 117.80
  4. Step 4: Simplify right side
    211.08x = 34,312.78
  5. Step 5: Solve for x
    x = 34,312.78/211.08
  6. Step 6: Final answer
    x = 162.56

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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.