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Finding the Fourth Proportional to 2,803.80, 3,862.10 and 2,139.50

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Solution

The fourth proportional to 2,803.80, 3,862.10 and 2,139.50 is: 2,947.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,803.80 : 3,862.10 = 2,139.50 : x
  2. Step 2: Convert to fraction form
    2,803.80/3,862.10 = 2,139.50/x
  3. Step 3: Cross multiply
    2,803.80x = 3,862.10 × 2,139.50
  4. Step 4: Simplify right side
    2,803.80x = 8,262,962.95
  5. Step 5: Solve for x
    x = 8,262,962.95/2,803.80
  6. Step 6: Final answer
    x = 2,947.06

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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.