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Finding the Fourth Proportional to 869.33, 1,305.15 and 518.59

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Solution

The fourth proportional to 869.33, 1,305.15 and 518.59 is: 778.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.33 : 1,305.15 = 518.59 : x
  2. Step 2: Convert to fraction form
    869.33/1,305.15 = 518.59/x
  3. Step 3: Cross multiply
    869.33x = 1,305.15 × 518.59
  4. Step 4: Simplify right side
    869.33x = 676,834.48
  5. Step 5: Solve for x
    x = 676,834.48/869.33
  6. Step 6: Final answer
    x = 778.57

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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.