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Finding the Fourth Proportional to 1,144.88, 1,716.50 and 815.81

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Solution

The fourth proportional to 1,144.88, 1,716.50 and 815.81 is: 1,223.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.88 : 1,716.50 = 815.81 : x
  2. Step 2: Convert to fraction form
    1,144.88/1,716.50 = 815.81/x
  3. Step 3: Cross multiply
    1,144.88x = 1,716.50 × 815.81
  4. Step 4: Simplify right side
    1,144.88x = 1,400,344.20
  5. Step 5: Solve for x
    x = 1,400,344.20/1,144.88
  6. Step 6: Final answer
    x = 1,223.14

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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.