Home / 3,870.09-5,340.87-2,191.57

Finding the Fourth Proportional to 3,870.09, 5,340.87 and 2,191.57

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Solution

The fourth proportional to 3,870.09, 5,340.87 and 2,191.57 is: 3,024.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,870.09 : 5,340.87 = 2,191.57 : x
  2. Step 2: Convert to fraction form
    3,870.09/5,340.87 = 2,191.57/x
  3. Step 3: Cross multiply
    3,870.09x = 5,340.87 × 2,191.57
  4. Step 4: Simplify right side
    3,870.09x = 11,704,877.11
  5. Step 5: Solve for x
    x = 11,704,877.11/3,870.09
  6. Step 6: Final answer
    x = 3,024.45

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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.