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Finding the Fourth Proportional to 211.96, 317.96 and 90.23

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Solution

The fourth proportional to 211.96, 317.96 and 90.23 is: 135.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.96 : 317.96 = 90.23 : x
  2. Step 2: Convert to fraction form
    211.96/317.96 = 90.23/x
  3. Step 3: Cross multiply
    211.96x = 317.96 × 90.23
  4. Step 4: Simplify right side
    211.96x = 28,690.21
  5. Step 5: Solve for x
    x = 28,690.21/211.96
  6. Step 6: Final answer
    x = 135.36

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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.