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Finding the Fourth Proportional to 319.88, 479.71 and 114.40

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Solution

The fourth proportional to 319.88, 479.71 and 114.40 is: 171.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.88 : 479.71 = 114.40 : x
  2. Step 2: Convert to fraction form
    319.88/479.71 = 114.40/x
  3. Step 3: Cross multiply
    319.88x = 479.71 × 114.40
  4. Step 4: Simplify right side
    319.88x = 54,876.22
  5. Step 5: Solve for x
    x = 54,876.22/319.88
  6. Step 6: Final answer
    x = 171.55

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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.