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Finding the Fourth Proportional to 664.76, 995.69 and 426.92

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Solution

The fourth proportional to 664.76, 995.69 and 426.92 is: 639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.76 : 995.69 = 426.92 : x
  2. Step 2: Convert to fraction form
    664.76/995.69 = 426.92/x
  3. Step 3: Cross multiply
    664.76x = 995.69 × 426.92
  4. Step 4: Simplify right side
    664.76x = 425,081.66
  5. Step 5: Solve for x
    x = 425,081.66/664.76
  6. Step 6: Final answer
    x = 639.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.