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Finding the Fourth Proportional to 1,344, 1,854.80 and 820.16

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Solution

The fourth proportional to 1,344, 1,854.80 and 820.16 is: 1,131.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,344 : 1,854.80 = 820.16 : x
  2. Step 2: Convert to fraction form
    1,344/1,854.80 = 820.16/x
  3. Step 3: Cross multiply
    1,344x = 1,854.80 × 820.16
  4. Step 4: Simplify right side
    1,344x = 1,521,232.77
  5. Step 5: Solve for x
    x = 1,521,232.77/1,344
  6. Step 6: Final answer
    x = 1,131.87

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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.