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Finding the Fourth Proportional to 1,787.90, 2,467.27 and 980.35

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Solution

The fourth proportional to 1,787.90, 2,467.27 and 980.35 is: 1,352.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.90 : 2,467.27 = 980.35 : x
  2. Step 2: Convert to fraction form
    1,787.90/2,467.27 = 980.35/x
  3. Step 3: Cross multiply
    1,787.90x = 2,467.27 × 980.35
  4. Step 4: Simplify right side
    1,787.90x = 2,418,785.69
  5. Step 5: Solve for x
    x = 2,418,785.69/1,787.90
  6. Step 6: Final answer
    x = 1,352.87

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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.