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Finding the Fourth Proportional to 664.95, 997.81 and 479.66

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Solution

The fourth proportional to 664.95, 997.81 and 479.66 is: 719.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.95 : 997.81 = 479.66 : x
  2. Step 2: Convert to fraction form
    664.95/997.81 = 479.66/x
  3. Step 3: Cross multiply
    664.95x = 997.81 × 479.66
  4. Step 4: Simplify right side
    664.95x = 478,610.84
  5. Step 5: Solve for x
    x = 478,610.84/664.95
  6. Step 6: Final answer
    x = 719.77

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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.