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Finding the Fourth Proportional to 825.36, 1,138.08 and 615.66

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Solution

The fourth proportional to 825.36, 1,138.08 and 615.66 is: 848.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.36 : 1,138.08 = 615.66 : x
  2. Step 2: Convert to fraction form
    825.36/1,138.08 = 615.66/x
  3. Step 3: Cross multiply
    825.36x = 1,138.08 × 615.66
  4. Step 4: Simplify right side
    825.36x = 700,670.33
  5. Step 5: Solve for x
    x = 700,670.33/825.36
  6. Step 6: Final answer
    x = 848.93

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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.