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Finding the Fourth Proportional to 968.73, 1,449.60 and 840.25

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Solution

The fourth proportional to 968.73, 1,449.60 and 840.25 is: 1,257.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.73 : 1,449.60 = 840.25 : x
  2. Step 2: Convert to fraction form
    968.73/1,449.60 = 840.25/x
  3. Step 3: Cross multiply
    968.73x = 1,449.60 × 840.25
  4. Step 4: Simplify right side
    968.73x = 1,218,026.40
  5. Step 5: Solve for x
    x = 1,218,026.40/968.73
  6. Step 6: Final answer
    x = 1,257.34

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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.