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Finding the Fourth Proportional to 869.25, 1,199.55 and 515.19

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Solution

The fourth proportional to 869.25, 1,199.55 and 515.19 is: 710.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.25 : 1,199.55 = 515.19 : x
  2. Step 2: Convert to fraction form
    869.25/1,199.55 = 515.19/x
  3. Step 3: Cross multiply
    869.25x = 1,199.55 × 515.19
  4. Step 4: Simplify right side
    869.25x = 617,996.16
  5. Step 5: Solve for x
    x = 617,996.16/869.25
  6. Step 6: Final answer
    x = 710.95

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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.