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Finding the Fourth Proportional to 1,519, 2,278.72 and 478.65

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Solution

The fourth proportional to 1,519, 2,278.72 and 478.65 is: 718.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,519 : 2,278.72 = 478.65 : x
  2. Step 2: Convert to fraction form
    1,519/2,278.72 = 478.65/x
  3. Step 3: Cross multiply
    1,519x = 2,278.72 × 478.65
  4. Step 4: Simplify right side
    1,519x = 1,090,709.33
  5. Step 5: Solve for x
    x = 1,090,709.33/1,519
  6. Step 6: Final answer
    x = 718.04

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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.