Home / 1,279.28-1,909.58-1,097.84

Finding the Fourth Proportional to 1,279.28, 1,909.58 and 1,097.84

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Solution

The fourth proportional to 1,279.28, 1,909.58 and 1,097.84 is: 1,638.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.28 : 1,909.58 = 1,097.84 : x
  2. Step 2: Convert to fraction form
    1,279.28/1,909.58 = 1,097.84/x
  3. Step 3: Cross multiply
    1,279.28x = 1,909.58 × 1,097.84
  4. Step 4: Simplify right side
    1,279.28x = 2,096,413.31
  5. Step 5: Solve for x
    x = 2,096,413.31/1,279.28
  6. Step 6: Final answer
    x = 1,638.74

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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.