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Finding the Fourth Proportional to 922.41, 1,382.67 and 678.60

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Solution

The fourth proportional to 922.41, 1,382.67 and 678.60 is: 1,017.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.41 : 1,382.67 = 678.60 : x
  2. Step 2: Convert to fraction form
    922.41/1,382.67 = 678.60/x
  3. Step 3: Cross multiply
    922.41x = 1,382.67 × 678.60
  4. Step 4: Simplify right side
    922.41x = 938,279.86
  5. Step 5: Solve for x
    x = 938,279.86/922.41
  6. Step 6: Final answer
    x = 1,017.20

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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.