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Finding the Fourth Proportional to 869.97, 1,199.96 and 621.57

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Solution

The fourth proportional to 869.97, 1,199.96 and 621.57 is: 857.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.97 : 1,199.96 = 621.57 : x
  2. Step 2: Convert to fraction form
    869.97/1,199.96 = 621.57/x
  3. Step 3: Cross multiply
    869.97x = 1,199.96 × 621.57
  4. Step 4: Simplify right side
    869.97x = 745,856.03
  5. Step 5: Solve for x
    x = 745,856.03/869.97
  6. Step 6: Final answer
    x = 857.34

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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.