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Finding the Fourth Proportional to 268.99, 405.56 and 215.53

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Solution

The fourth proportional to 268.99, 405.56 and 215.53 is: 324.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.99 : 405.56 = 215.53 : x
  2. Step 2: Convert to fraction form
    268.99/405.56 = 215.53/x
  3. Step 3: Cross multiply
    268.99x = 405.56 × 215.53
  4. Step 4: Simplify right side
    268.99x = 87,410.35
  5. Step 5: Solve for x
    x = 87,410.35/268.99
  6. Step 6: Final answer
    x = 324.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.