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Finding the Fourth Proportional to 100,378.80, 138,519 and 55,055.52

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Solution

The fourth proportional to 100,378.80, 138,519 and 55,055.52 is: 75,974.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,378.80 : 138,519 = 55,055.52 : x
  2. Step 2: Convert to fraction form
    100,378.80/138,519 = 55,055.52/x
  3. Step 3: Cross multiply
    100,378.80x = 138,519 × 55,055.52
  4. Step 4: Simplify right side
    100,378.80x = 7,626,235,574.88
  5. Step 5: Solve for x
    x = 7,626,235,574.88/100,378.80
  6. Step 6: Final answer
    x = 75,974.56

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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.