Home / 3,178.75-4,386.60-1,920.85

Finding the Fourth Proportional to 3,178.75, 4,386.60 and 1,920.85

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Solution

The fourth proportional to 3,178.75, 4,386.60 and 1,920.85 is: 2,650.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.75 : 4,386.60 = 1,920.85 : x
  2. Step 2: Convert to fraction form
    3,178.75/4,386.60 = 1,920.85/x
  3. Step 3: Cross multiply
    3,178.75x = 4,386.60 × 1,920.85
  4. Step 4: Simplify right side
    3,178.75x = 8,426,000.61
  5. Step 5: Solve for x
    x = 8,426,000.61/3,178.75
  6. Step 6: Final answer
    x = 2,650.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.