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Finding the Fourth Proportional to 1,787.95, 2,467.28 and 991.27

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Solution

The fourth proportional to 1,787.95, 2,467.28 and 991.27 is: 1,367.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.95 : 2,467.28 = 991.27 : x
  2. Step 2: Convert to fraction form
    1,787.95/2,467.28 = 991.27/x
  3. Step 3: Cross multiply
    1,787.95x = 2,467.28 × 991.27
  4. Step 4: Simplify right side
    1,787.95x = 2,445,726.75
  5. Step 5: Solve for x
    x = 2,445,726.75/1,787.95
  6. Step 6: Final answer
    x = 1,367.90

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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.