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Finding the Fourth Proportional to 390.27, 584.85 and 261.75

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Solution

The fourth proportional to 390.27, 584.85 and 261.75 is: 392.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.27 : 584.85 = 261.75 : x
  2. Step 2: Convert to fraction form
    390.27/584.85 = 261.75/x
  3. Step 3: Cross multiply
    390.27x = 584.85 × 261.75
  4. Step 4: Simplify right side
    390.27x = 153,084.49
  5. Step 5: Solve for x
    x = 153,084.49/390.27
  6. Step 6: Final answer
    x = 392.25

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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.