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Finding the Fourth Proportional to 922.82, 1,273.24 and 642.74

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Solution

The fourth proportional to 922.82, 1,273.24 and 642.74 is: 886.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.82 : 1,273.24 = 642.74 : x
  2. Step 2: Convert to fraction form
    922.82/1,273.24 = 642.74/x
  3. Step 3: Cross multiply
    922.82x = 1,273.24 × 642.74
  4. Step 4: Simplify right side
    922.82x = 818,362.28
  5. Step 5: Solve for x
    x = 818,362.28/922.82
  6. Step 6: Final answer
    x = 886.81

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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.