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Finding the Fourth Proportional to 3,787.78, 5,681.72 and 1,322.61

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Solution

The fourth proportional to 3,787.78, 5,681.72 and 1,322.61 is: 1,983.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,787.78 : 5,681.72 = 1,322.61 : x
  2. Step 2: Convert to fraction form
    3,787.78/5,681.72 = 1,322.61/x
  3. Step 3: Cross multiply
    3,787.78x = 5,681.72 × 1,322.61
  4. Step 4: Simplify right side
    3,787.78x = 7,514,693.08
  5. Step 5: Solve for x
    x = 7,514,693.08/3,787.78
  6. Step 6: Final answer
    x = 1,983.93

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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.