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Finding the Fourth Proportional to 620.48, 855.96 and 522.20

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Solution

The fourth proportional to 620.48, 855.96 and 522.20 is: 720.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.48 : 855.96 = 522.20 : x
  2. Step 2: Convert to fraction form
    620.48/855.96 = 522.20/x
  3. Step 3: Cross multiply
    620.48x = 855.96 × 522.20
  4. Step 4: Simplify right side
    620.48x = 446,982.31
  5. Step 5: Solve for x
    x = 446,982.31/620.48
  6. Step 6: Final answer
    x = 720.38

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1.5x scale

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.