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Finding the Fourth Proportional to 869.52, 1,200.08 and 515.45

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Solution

The fourth proportional to 869.52, 1,200.08 and 515.45 is: 711.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.52 : 1,200.08 = 515.45 : x
  2. Step 2: Convert to fraction form
    869.52/1,200.08 = 515.45/x
  3. Step 3: Cross multiply
    869.52x = 1,200.08 × 515.45
  4. Step 4: Simplify right side
    869.52x = 618,581.24
  5. Step 5: Solve for x
    x = 618,581.24/869.52
  6. Step 6: Final answer
    x = 711.41

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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.