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Finding the Fourth Proportional to 825.49, 1,139.11 and 493.80

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Solution

The fourth proportional to 825.49, 1,139.11 and 493.80 is: 681.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.49 : 1,139.11 = 493.80 : x
  2. Step 2: Convert to fraction form
    825.49/1,139.11 = 493.80/x
  3. Step 3: Cross multiply
    825.49x = 1,139.11 × 493.80
  4. Step 4: Simplify right side
    825.49x = 562,489.79
  5. Step 5: Solve for x
    x = 562,489.79/825.49
  6. Step 6: Final answer
    x = 681.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.