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Finding the Fourth Proportional to 302.91, 417.96 and 261.78

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Solution

The fourth proportional to 302.91, 417.96 and 261.78 is: 361.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.91 : 417.96 = 261.78 : x
  2. Step 2: Convert to fraction form
    302.91/417.96 = 261.78/x
  3. Step 3: Cross multiply
    302.91x = 417.96 × 261.78
  4. Step 4: Simplify right side
    302.91x = 109,413.57
  5. Step 5: Solve for x
    x = 109,413.57/302.91
  6. Step 6: Final answer
    x = 361.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.