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Finding the Fourth Proportional to 869.26, 1,199.28 and 515.10

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Solution

The fourth proportional to 869.26, 1,199.28 and 515.10 is: 710.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.26 : 1,199.28 = 515.10 : x
  2. Step 2: Convert to fraction form
    869.26/1,199.28 = 515.10/x
  3. Step 3: Cross multiply
    869.26x = 1,199.28 × 515.10
  4. Step 4: Simplify right side
    869.26x = 617,749.13
  5. Step 5: Solve for x
    x = 617,749.13/869.26
  6. Step 6: Final answer
    x = 710.66

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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.