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Finding the Fourth Proportional to 664.13, 991.14 and 620.12

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Solution

The fourth proportional to 664.13, 991.14 and 620.12 is: 925.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.13 : 991.14 = 620.12 : x
  2. Step 2: Convert to fraction form
    664.13/991.14 = 620.12/x
  3. Step 3: Cross multiply
    664.13x = 991.14 × 620.12
  4. Step 4: Simplify right side
    664.13x = 614,620.78
  5. Step 5: Solve for x
    x = 614,620.78/664.13
  6. Step 6: Final answer
    x = 925.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.