Home / 138,859.67-191,626.97-78,431.04

Finding the Fourth Proportional to 138,859.67, 191,626.97 and 78,431.04

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Solution

The fourth proportional to 138,859.67, 191,626.97 and 78,431.04 is: 108,235.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,859.67 : 191,626.97 = 78,431.04 : x
  2. Step 2: Convert to fraction form
    138,859.67/191,626.97 = 78,431.04/x
  3. Step 3: Cross multiply
    138,859.67x = 191,626.97 × 78,431.04
  4. Step 4: Simplify right side
    138,859.67x = 15,029,502,156.99
  5. Step 5: Solve for x
    x = 15,029,502,156.99/138,859.67
  6. Step 6: Final answer
    x = 108,235.18

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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.