Home / 3,923.90-5,415.10-2,155.50

Finding the Fourth Proportional to 3,923.90, 5,415.10 and 2,155.50

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Solution

The fourth proportional to 3,923.90, 5,415.10 and 2,155.50 is: 2,974.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,923.90 : 5,415.10 = 2,155.50 : x
  2. Step 2: Convert to fraction form
    3,923.90/5,415.10 = 2,155.50/x
  3. Step 3: Cross multiply
    3,923.90x = 5,415.10 × 2,155.50
  4. Step 4: Simplify right side
    3,923.90x = 11,672,248.05
  5. Step 5: Solve for x
    x = 11,672,248.05/3,923.90
  6. Step 6: Final answer
    x = 2,974.65

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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.