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Finding the Fourth Proportional to 620.43, 855.16 and 515.31

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Solution

The fourth proportional to 620.43, 855.16 and 515.31 is: 710.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.43 : 855.16 = 515.31 : x
  2. Step 2: Convert to fraction form
    620.43/855.16 = 515.31/x
  3. Step 3: Cross multiply
    620.43x = 855.16 × 515.31
  4. Step 4: Simplify right side
    620.43x = 440,672.50
  5. Step 5: Solve for x
    x = 440,672.50/620.43
  6. Step 6: Final answer
    x = 710.27

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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.