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Finding the Fourth Proportional to 1,144.48, 1,715.28 and 820.48

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Solution

The fourth proportional to 1,144.48, 1,715.28 and 820.48 is: 1,229.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.48 : 1,715.28 = 820.48 : x
  2. Step 2: Convert to fraction form
    1,144.48/1,715.28 = 820.48/x
  3. Step 3: Cross multiply
    1,144.48x = 1,715.28 × 820.48
  4. Step 4: Simplify right side
    1,144.48x = 1,407,352.93
  5. Step 5: Solve for x
    x = 1,407,352.93/1,144.48
  6. Step 6: Final answer
    x = 1,229.69

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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.