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Finding the Fourth Proportional to 869.38, 1,199.59 and 574.49

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Solution

The fourth proportional to 869.38, 1,199.59 and 574.49 is: 792.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.38 : 1,199.59 = 574.49 : x
  2. Step 2: Convert to fraction form
    869.38/1,199.59 = 574.49/x
  3. Step 3: Cross multiply
    869.38x = 1,199.59 × 574.49
  4. Step 4: Simplify right side
    869.38x = 689,146.46
  5. Step 5: Solve for x
    x = 689,146.46/869.38
  6. Step 6: Final answer
    x = 792.69

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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.