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Finding the Fourth Proportional to 921.58, 1,271.92 and 572.38

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Solution

The fourth proportional to 921.58, 1,271.92 and 572.38 is: 789.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.58 : 1,271.92 = 572.38 : x
  2. Step 2: Convert to fraction form
    921.58/1,271.92 = 572.38/x
  3. Step 3: Cross multiply
    921.58x = 1,271.92 × 572.38
  4. Step 4: Simplify right side
    921.58x = 728,021.57
  5. Step 5: Solve for x
    x = 728,021.57/921.58
  6. Step 6: Final answer
    x = 789.97

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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.