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Finding the Fourth Proportional to 1,144.60, 1,716.90 and 278.90

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Solution

The fourth proportional to 1,144.60, 1,716.90 and 278.90 is: 418.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.60 : 1,716.90 = 278.90 : x
  2. Step 2: Convert to fraction form
    1,144.60/1,716.90 = 278.90/x
  3. Step 3: Cross multiply
    1,144.60x = 1,716.90 × 278.90
  4. Step 4: Simplify right side
    1,144.60x = 478,847.70
  5. Step 5: Solve for x
    x = 478,847.70/1,144.60
  6. Step 6: Final answer
    x = 418.35

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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.