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Finding the Fourth Proportional to 211.40, 316.88 and 108.62

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Solution

The fourth proportional to 211.40, 316.88 and 108.62 is: 162.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.40 : 316.88 = 108.62 : x
  2. Step 2: Convert to fraction form
    211.40/316.88 = 108.62/x
  3. Step 3: Cross multiply
    211.40x = 316.88 × 108.62
  4. Step 4: Simplify right side
    211.40x = 34,419.51
  5. Step 5: Solve for x
    x = 34,419.51/211.40
  6. Step 6: Final answer
    x = 162.82

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.