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Finding the Fourth Proportional to 268.99, 401.30 and 261.55

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Solution

The fourth proportional to 268.99, 401.30 and 261.55 is: 390.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.99 : 401.30 = 261.55 : x
  2. Step 2: Convert to fraction form
    268.99/401.30 = 261.55/x
  3. Step 3: Cross multiply
    268.99x = 401.30 × 261.55
  4. Step 4: Simplify right side
    268.99x = 104,958.71
  5. Step 5: Solve for x
    x = 104,958.71/268.99
  6. Step 6: Final answer
    x = 390.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.