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Finding the Fourth Proportional to 1,344, 1,855.05 and 820.47

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Solution

The fourth proportional to 1,344, 1,855.05 and 820.47 is: 1,132.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,344 : 1,855.05 = 820.47 : x
  2. Step 2: Convert to fraction form
    1,344/1,855.05 = 820.47/x
  3. Step 3: Cross multiply
    1,344x = 1,855.05 × 820.47
  4. Step 4: Simplify right side
    1,344x = 1,522,012.87
  5. Step 5: Solve for x
    x = 1,522,012.87/1,344
  6. Step 6: Final answer
    x = 1,132.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.