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Finding the Fourth Proportional to 825.22, 1,138.77 and 493.57

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Solution

The fourth proportional to 825.22, 1,138.77 and 493.57 is: 681.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.22 : 1,138.77 = 493.57 : x
  2. Step 2: Convert to fraction form
    825.22/1,138.77 = 493.57/x
  3. Step 3: Cross multiply
    825.22x = 1,138.77 × 493.57
  4. Step 4: Simplify right side
    825.22x = 562,062.71
  5. Step 5: Solve for x
    x = 562,062.71/825.22
  6. Step 6: Final answer
    x = 681.11

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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.