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Finding the Fourth Proportional to 869.19, 1,305.78 and 561.64

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Solution

The fourth proportional to 869.19, 1,305.78 and 561.64 is: 843.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.19 : 1,305.78 = 561.64 : x
  2. Step 2: Convert to fraction form
    869.19/1,305.78 = 561.64/x
  3. Step 3: Cross multiply
    869.19x = 1,305.78 × 561.64
  4. Step 4: Simplify right side
    869.19x = 733,372.91
  5. Step 5: Solve for x
    x = 733,372.91/869.19
  6. Step 6: Final answer
    x = 843.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.