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Finding the Fourth Proportional to 1,144.48, 1,716.72 and 278.79

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Solution

The fourth proportional to 1,144.48, 1,716.72 and 278.79 is: 418.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.48 : 1,716.72 = 278.79 : x
  2. Step 2: Convert to fraction form
    1,144.48/1,716.72 = 278.79/x
  3. Step 3: Cross multiply
    1,144.48x = 1,716.72 × 278.79
  4. Step 4: Simplify right side
    1,144.48x = 478,594.39
  5. Step 5: Solve for x
    x = 478,594.39/1,144.48
  6. Step 6: Final answer
    x = 418.18

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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.