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Finding the Fourth Proportional to 665.81, 998.70 and 549.17

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Solution

The fourth proportional to 665.81, 998.70 and 549.17 is: 823.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.81 : 998.70 = 549.17 : x
  2. Step 2: Convert to fraction form
    665.81/998.70 = 549.17/x
  3. Step 3: Cross multiply
    665.81x = 998.70 × 549.17
  4. Step 4: Simplify right side
    665.81x = 548,451.09
  5. Step 5: Solve for x
    x = 548,451.09/665.81
  6. Step 6: Final answer
    x = 823.74

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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.