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Finding the Fourth Proportional to 620.72, 849.12 and 611.20

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Solution

The fourth proportional to 620.72, 849.12 and 611.20 is: 836.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.72 : 849.12 = 611.20 : x
  2. Step 2: Convert to fraction form
    620.72/849.12 = 611.20/x
  3. Step 3: Cross multiply
    620.72x = 849.12 × 611.20
  4. Step 4: Simplify right side
    620.72x = 518,982.14
  5. Step 5: Solve for x
    x = 518,982.14/620.72
  6. Step 6: Final answer
    x = 836.10

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.