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Finding the Fourth Proportional to 664.64, 994.80 and 609.20

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Solution

The fourth proportional to 664.64, 994.80 and 609.20 is: 911.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.64 : 994.80 = 609.20 : x
  2. Step 2: Convert to fraction form
    664.64/994.80 = 609.20/x
  3. Step 3: Cross multiply
    664.64x = 994.80 × 609.20
  4. Step 4: Simplify right side
    664.64x = 606,032.16
  5. Step 5: Solve for x
    x = 606,032.16/664.64
  6. Step 6: Final answer
    x = 911.82

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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.