Home / 138,749.20-191,482.51-78,297.78

Finding the Fourth Proportional to 138,749.20, 191,482.51 and 78,297.78

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Solution

The fourth proportional to 138,749.20, 191,482.51 and 78,297.78 is: 108,055.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,749.20 : 191,482.51 = 78,297.78 : x
  2. Step 2: Convert to fraction form
    138,749.20/191,482.51 = 78,297.78/x
  3. Step 3: Cross multiply
    138,749.20x = 191,482.51 × 78,297.78
  4. Step 4: Simplify right side
    138,749.20x = 14,992,655,441.83
  5. Step 5: Solve for x
    x = 14,992,655,441.83/138,749.20
  6. Step 6: Final answer
    x = 108,055.80

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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.