Home / 138,677.12-191,360.04-78,251.12

Finding the Fourth Proportional to 138,677.12, 191,360.04 and 78,251.12

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Solution

The fourth proportional to 138,677.12, 191,360.04 and 78,251.12 is: 107,978.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,677.12 : 191,360.04 = 78,251.12 : x
  2. Step 2: Convert to fraction form
    138,677.12/191,360.04 = 78,251.12/x
  3. Step 3: Cross multiply
    138,677.12x = 191,360.04 × 78,251.12
  4. Step 4: Simplify right side
    138,677.12x = 14,974,137,453.24
  5. Step 5: Solve for x
    x = 14,974,137,453.24/138,677.12
  6. Step 6: Final answer
    x = 107,978.43

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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.