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Finding the Fourth Proportional to 285.68, 426.42 and 261.33

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Solution

The fourth proportional to 285.68, 426.42 and 261.33 is: 390.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.68 : 426.42 = 261.33 : x
  2. Step 2: Convert to fraction form
    285.68/426.42 = 261.33/x
  3. Step 3: Cross multiply
    285.68x = 426.42 × 261.33
  4. Step 4: Simplify right side
    285.68x = 111,436.69
  5. Step 5: Solve for x
    x = 111,436.69/285.68
  6. Step 6: Final answer
    x = 390.08

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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.