Home / 138,767.10-191,499.20-78,338.49

Finding the Fourth Proportional to 138,767.10, 191,499.20 and 78,338.49

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Solution

The fourth proportional to 138,767.10, 191,499.20 and 78,338.49 is: 108,107.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,767.10 : 191,499.20 = 78,338.49 : x
  2. Step 2: Convert to fraction form
    138,767.10/191,499.20 = 78,338.49/x
  3. Step 3: Cross multiply
    138,767.10x = 191,499.20 × 78,338.49
  4. Step 4: Simplify right side
    138,767.10x = 15,001,758,164.21
  5. Step 5: Solve for x
    x = 15,001,758,164.21/138,767.10
  6. Step 6: Final answer
    x = 108,107.46

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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.