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Finding the Fourth Proportional to 869.31, 1,199.78 and 554.71

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Solution

The fourth proportional to 869.31, 1,199.78 and 554.71 is: 765.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.31 : 1,199.78 = 554.71 : x
  2. Step 2: Convert to fraction form
    869.31/1,199.78 = 554.71/x
  3. Step 3: Cross multiply
    869.31x = 1,199.78 × 554.71
  4. Step 4: Simplify right side
    869.31x = 665,529.96
  5. Step 5: Solve for x
    x = 665,529.96/869.31
  6. Step 6: Final answer
    x = 765.58

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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.