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Finding the Fourth Proportional to 210.91, 291.06 and 117.66

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Solution

The fourth proportional to 210.91, 291.06 and 117.66 is: 162.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.91 : 291.06 = 117.66 : x
  2. Step 2: Convert to fraction form
    210.91/291.06 = 117.66/x
  3. Step 3: Cross multiply
    210.91x = 291.06 × 117.66
  4. Step 4: Simplify right side
    210.91x = 34,245.57
  5. Step 5: Solve for x
    x = 34,245.57/210.91
  6. Step 6: Final answer
    x = 162.37

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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.