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Finding the Fourth Proportional to 1,078.74, 1,609.38 and 922.86

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Solution

The fourth proportional to 1,078.74, 1,609.38 and 922.86 is: 1,376.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.74 : 1,609.38 = 922.86 : x
  2. Step 2: Convert to fraction form
    1,078.74/1,609.38 = 922.86/x
  3. Step 3: Cross multiply
    1,078.74x = 1,609.38 × 922.86
  4. Step 4: Simplify right side
    1,078.74x = 1,485,232.43
  5. Step 5: Solve for x
    x = 1,485,232.43/1,078.74
  6. Step 6: Final answer
    x = 1,376.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.