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Finding the Fourth Proportional to 868.19, 1,199.75 and 620.73

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Solution

The fourth proportional to 868.19, 1,199.75 and 620.73 is: 857.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.19 : 1,199.75 = 620.73 : x
  2. Step 2: Convert to fraction form
    868.19/1,199.75 = 620.73/x
  3. Step 3: Cross multiply
    868.19x = 1,199.75 × 620.73
  4. Step 4: Simplify right side
    868.19x = 744,717.71
  5. Step 5: Solve for x
    x = 744,717.71/868.19
  6. Step 6: Final answer
    x = 857.79

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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.