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Finding the Fourth Proportional to 479.87, 719.81 and 191.51

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Solution

The fourth proportional to 479.87, 719.81 and 191.51 is: 287.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.87 : 719.81 = 191.51 : x
  2. Step 2: Convert to fraction form
    479.87/719.81 = 191.51/x
  3. Step 3: Cross multiply
    479.87x = 719.81 × 191.51
  4. Step 4: Simplify right side
    479.87x = 137,850.81
  5. Step 5: Solve for x
    x = 137,850.81/479.87
  6. Step 6: Final answer
    x = 287.27

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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.