Home / 138,436.05-191,037.78-78,005.61

Finding the Fourth Proportional to 138,436.05, 191,037.78 and 78,005.61

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Solution

The fourth proportional to 138,436.05, 191,037.78 and 78,005.61 is: 107,645.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,436.05 : 191,037.78 = 78,005.61 : x
  2. Step 2: Convert to fraction form
    138,436.05/191,037.78 = 78,005.61/x
  3. Step 3: Cross multiply
    138,436.05x = 191,037.78 × 78,005.61
  4. Step 4: Simplify right side
    138,436.05x = 14,902,018,561.95
  5. Step 5: Solve for x
    x = 14,902,018,561.95/138,436.05
  6. Step 6: Final answer
    x = 107,645.51

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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.