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Finding the Fourth Proportional to 825.06, 1,138.20 and 493.32

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Solution

The fourth proportional to 825.06, 1,138.20 and 493.32 is: 680.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.06 : 1,138.20 = 493.32 : x
  2. Step 2: Convert to fraction form
    825.06/1,138.20 = 493.32/x
  3. Step 3: Cross multiply
    825.06x = 1,138.20 × 493.32
  4. Step 4: Simplify right side
    825.06x = 561,496.82
  5. Step 5: Solve for x
    x = 561,496.82/825.06
  6. Step 6: Final answer
    x = 680.55

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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.