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Finding the Fourth Proportional to 1,787.90, 2,467.20 and 991.16

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Solution

The fourth proportional to 1,787.90, 2,467.20 and 991.16 is: 1,367.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.90 : 2,467.20 = 991.16 : x
  2. Step 2: Convert to fraction form
    1,787.90/2,467.20 = 991.16/x
  3. Step 3: Cross multiply
    1,787.90x = 2,467.20 × 991.16
  4. Step 4: Simplify right side
    1,787.90x = 2,445,389.95
  5. Step 5: Solve for x
    x = 2,445,389.95/1,787.90
  6. Step 6: Final answer
    x = 1,367.74

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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.