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Finding the Fourth Proportional to 319.61, 479.90 and 261.23

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Solution

The fourth proportional to 319.61, 479.90 and 261.23 is: 392.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.61 : 479.90 = 261.23 : x
  2. Step 2: Convert to fraction form
    319.61/479.90 = 261.23/x
  3. Step 3: Cross multiply
    319.61x = 479.90 × 261.23
  4. Step 4: Simplify right side
    319.61x = 125,360.57
  5. Step 5: Solve for x
    x = 125,360.57/319.61
  6. Step 6: Final answer
    x = 392.23

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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.