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Finding the Fourth Proportional to 211.96, 317.78 and 90.16

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Solution

The fourth proportional to 211.96, 317.78 and 90.16 is: 135.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.96 : 317.78 = 90.16 : x
  2. Step 2: Convert to fraction form
    211.96/317.78 = 90.16/x
  3. Step 3: Cross multiply
    211.96x = 317.78 × 90.16
  4. Step 4: Simplify right side
    211.96x = 28,651.04
  5. Step 5: Solve for x
    x = 28,651.04/211.96
  6. Step 6: Final answer
    x = 135.17

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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.