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Finding the Fourth Proportional to 922.20, 1,390.94 and 861.45

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Solution

The fourth proportional to 922.20, 1,390.94 and 861.45 is: 1,299.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.20 : 1,390.94 = 861.45 : x
  2. Step 2: Convert to fraction form
    922.20/1,390.94 = 861.45/x
  3. Step 3: Cross multiply
    922.20x = 1,390.94 × 861.45
  4. Step 4: Simplify right side
    922.20x = 1,198,220.96
  5. Step 5: Solve for x
    x = 1,198,220.96/922.20
  6. Step 6: Final answer
    x = 1,299.31

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.