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Finding the Fourth Proportional to 1,680.97, 2,520.63 and 978.42

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Solution

The fourth proportional to 1,680.97, 2,520.63 and 978.42 is: 1,467.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.97 : 2,520.63 = 978.42 : x
  2. Step 2: Convert to fraction form
    1,680.97/2,520.63 = 978.42/x
  3. Step 3: Cross multiply
    1,680.97x = 2,520.63 × 978.42
  4. Step 4: Simplify right side
    1,680.97x = 2,466,237.67
  5. Step 5: Solve for x
    x = 2,466,237.67/1,680.97
  6. Step 6: Final answer
    x = 1,467.15

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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.