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Finding the Fourth Proportional to 268.79, 403.52 and 211.21

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Solution

The fourth proportional to 268.79, 403.52 and 211.21 is: 317.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.79 : 403.52 = 211.21 : x
  2. Step 2: Convert to fraction form
    268.79/403.52 = 211.21/x
  3. Step 3: Cross multiply
    268.79x = 403.52 × 211.21
  4. Step 4: Simplify right side
    268.79x = 85,225.39
  5. Step 5: Solve for x
    x = 85,225.39/268.79
  6. Step 6: Final answer
    x = 317.08

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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.