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Finding the Fourth Proportional to 3,386.10, 5,078.55 and 920.61

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Solution

The fourth proportional to 3,386.10, 5,078.55 and 920.61 is: 1,380.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,386.10 : 5,078.55 = 920.61 : x
  2. Step 2: Convert to fraction form
    3,386.10/5,078.55 = 920.61/x
  3. Step 3: Cross multiply
    3,386.10x = 5,078.55 × 920.61
  4. Step 4: Simplify right side
    3,386.10x = 4,675,363.92
  5. Step 5: Solve for x
    x = 4,675,363.92/3,386.10
  6. Step 6: Final answer
    x = 1,380.75

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1.5x scale

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.