Home / 138,589.49-191,240.33-78,169.57

Finding the Fourth Proportional to 138,589.49, 191,240.33 and 78,169.57

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Solution

The fourth proportional to 138,589.49, 191,240.33 and 78,169.57 is: 107,866.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,589.49 : 191,240.33 = 78,169.57 : x
  2. Step 2: Convert to fraction form
    138,589.49/191,240.33 = 78,169.57/x
  3. Step 3: Cross multiply
    138,589.49x = 191,240.33 × 78,169.57
  4. Step 4: Simplify right side
    138,589.49x = 14,949,173,493.81
  5. Step 5: Solve for x
    x = 14,949,173,493.81/138,589.49
  6. Step 6: Final answer
    x = 107,866.57

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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.