Home / 138,707.20-191,415.16-78,297.48

Finding the Fourth Proportional to 138,707.20, 191,415.16 and 78,297.48

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Solution

The fourth proportional to 138,707.20, 191,415.16 and 78,297.48 is: 108,050.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,707.20 : 191,415.16 = 78,297.48 : x
  2. Step 2: Convert to fraction form
    138,707.20/191,415.16 = 78,297.48/x
  3. Step 3: Cross multiply
    138,707.20x = 191,415.16 × 78,297.48
  4. Step 4: Simplify right side
    138,707.20x = 14,987,324,661.80
  5. Step 5: Solve for x
    x = 14,987,324,661.80/138,707.20
  6. Step 6: Final answer
    x = 108,050.08

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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.