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Finding the Fourth Proportional to 825.61, 1,238.18 and 386.73

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Solution

The fourth proportional to 825.61, 1,238.18 and 386.73 is: 579.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.61 : 1,238.18 = 386.73 : x
  2. Step 2: Convert to fraction form
    825.61/1,238.18 = 386.73/x
  3. Step 3: Cross multiply
    825.61x = 1,238.18 × 386.73
  4. Step 4: Simplify right side
    825.61x = 478,833.23
  5. Step 5: Solve for x
    x = 478,833.23/825.61
  6. Step 6: Final answer
    x = 579.98

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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.