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Finding the Fourth Proportional to 1,519.40, 2,279 and 493.40

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Solution

The fourth proportional to 1,519.40, 2,279 and 493.40 is: 740.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,519.40 : 2,279 = 493.40 : x
  2. Step 2: Convert to fraction form
    1,519.40/2,279 = 493.40/x
  3. Step 3: Cross multiply
    1,519.40x = 2,279 × 493.40
  4. Step 4: Simplify right side
    1,519.40x = 1,124,458.60
  5. Step 5: Solve for x
    x = 1,124,458.60/1,519.40
  6. Step 6: Final answer
    x = 740.07

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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.