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Finding the Fourth Proportional to 725.03, 999.20 and 515.22

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Solution

The fourth proportional to 725.03, 999.20 and 515.22 is: 710.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.03 : 999.20 = 515.22 : x
  2. Step 2: Convert to fraction form
    725.03/999.20 = 515.22/x
  3. Step 3: Cross multiply
    725.03x = 999.20 × 515.22
  4. Step 4: Simplify right side
    725.03x = 514,807.82
  5. Step 5: Solve for x
    x = 514,807.82/725.03
  6. Step 6: Final answer
    x = 710.05

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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.