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Finding the Fourth Proportional to 984.72, 1,356.07 and 922.15

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Solution

The fourth proportional to 984.72, 1,356.07 and 922.15 is: 1,269.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.72 : 1,356.07 = 922.15 : x
  2. Step 2: Convert to fraction form
    984.72/1,356.07 = 922.15/x
  3. Step 3: Cross multiply
    984.72x = 1,356.07 × 922.15
  4. Step 4: Simplify right side
    984.72x = 1,250,499.95
  5. Step 5: Solve for x
    x = 1,250,499.95/984.72
  6. Step 6: Final answer
    x = 1,269.90

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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.