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Finding the Fourth Proportional to 1,217.92, 1,680.60 and 720.58

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Solution

The fourth proportional to 1,217.92, 1,680.60 and 720.58 is: 994.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.92 : 1,680.60 = 720.58 : x
  2. Step 2: Convert to fraction form
    1,217.92/1,680.60 = 720.58/x
  3. Step 3: Cross multiply
    1,217.92x = 1,680.60 × 720.58
  4. Step 4: Simplify right side
    1,217.92x = 1,211,006.75
  5. Step 5: Solve for x
    x = 1,211,006.75/1,217.92
  6. Step 6: Final answer
    x = 994.32

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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.