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Finding the Fourth Proportional to 869.67, 1,199.61 and 621.27

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Solution

The fourth proportional to 869.67, 1,199.61 and 621.27 is: 856.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.67 : 1,199.61 = 621.27 : x
  2. Step 2: Convert to fraction form
    869.67/1,199.61 = 621.27/x
  3. Step 3: Cross multiply
    869.67x = 1,199.61 × 621.27
  4. Step 4: Simplify right side
    869.67x = 745,281.70
  5. Step 5: Solve for x
    x = 745,281.70/869.67
  6. Step 6: Final answer
    x = 856.97

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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.