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Finding the Fourth Proportional to 479.75, 719.89 and 191.39

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Solution

The fourth proportional to 479.75, 719.89 and 191.39 is: 287.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.75 : 719.89 = 191.39 : x
  2. Step 2: Convert to fraction form
    479.75/719.89 = 191.39/x
  3. Step 3: Cross multiply
    479.75x = 719.89 × 191.39
  4. Step 4: Simplify right side
    479.75x = 137,775.67
  5. Step 5: Solve for x
    x = 137,775.67/479.75
  6. Step 6: Final answer
    x = 287.19

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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.