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Finding the Fourth Proportional to 839.29, 1,257.25 and 666.25

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Solution

The fourth proportional to 839.29, 1,257.25 and 666.25 is: 998.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.29 : 1,257.25 = 666.25 : x
  2. Step 2: Convert to fraction form
    839.29/1,257.25 = 666.25/x
  3. Step 3: Cross multiply
    839.29x = 1,257.25 × 666.25
  4. Step 4: Simplify right side
    839.29x = 837,642.81
  5. Step 5: Solve for x
    x = 837,642.81/839.29
  6. Step 6: Final answer
    x = 998.04

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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.