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Finding the Fourth Proportional to 1,217.82, 1,680.51 and 720.75

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Solution

The fourth proportional to 1,217.82, 1,680.51 and 720.75 is: 994.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.82 : 1,680.51 = 720.75 : x
  2. Step 2: Convert to fraction form
    1,217.82/1,680.51 = 720.75/x
  3. Step 3: Cross multiply
    1,217.82x = 1,680.51 × 720.75
  4. Step 4: Simplify right side
    1,217.82x = 1,211,227.58
  5. Step 5: Solve for x
    x = 1,211,227.58/1,217.82
  6. Step 6: Final answer
    x = 994.59

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1.5x scale

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.