Home / 100,278.12-138,378.39-54,956.19

Finding the Fourth Proportional to 100,278.12, 138,378.39 and 54,956.19

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Solution

The fourth proportional to 100,278.12, 138,378.39 and 54,956.19 is: 75,836.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,278.12 : 138,378.39 = 54,956.19 : x
  2. Step 2: Convert to fraction form
    100,278.12/138,378.39 = 54,956.19/x
  3. Step 3: Cross multiply
    100,278.12x = 138,378.39 × 54,956.19
  4. Step 4: Simplify right side
    100,278.12x = 7,604,748,936.32
  5. Step 5: Solve for x
    x = 7,604,748,936.32/100,278.12
  6. Step 6: Final answer
    x = 75,836.57

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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.