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Finding the Fourth Proportional to 869.63, 1,199.85 and 515.45

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Solution

The fourth proportional to 869.63, 1,199.85 and 515.45 is: 711.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.63 : 1,199.85 = 515.45 : x
  2. Step 2: Convert to fraction form
    869.63/1,199.85 = 515.45/x
  3. Step 3: Cross multiply
    869.63x = 1,199.85 × 515.45
  4. Step 4: Simplify right side
    869.63x = 618,456.68
  5. Step 5: Solve for x
    x = 618,456.68/869.63
  6. Step 6: Final answer
    x = 711.18

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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.