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Finding the Fourth Proportional to 922.15, 1,382.31 and 613.23

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Solution

The fourth proportional to 922.15, 1,382.31 and 613.23 is: 919.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.15 : 1,382.31 = 613.23 : x
  2. Step 2: Convert to fraction form
    922.15/1,382.31 = 613.23/x
  3. Step 3: Cross multiply
    922.15x = 1,382.31 × 613.23
  4. Step 4: Simplify right side
    922.15x = 847,673.96
  5. Step 5: Solve for x
    x = 847,673.96/922.15
  6. Step 6: Final answer
    x = 919.24

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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.