Home / 138,809.70-191,589-90,326.18

Finding the Fourth Proportional to 138,809.70, 191,589 and 90,326.18

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Solution

The fourth proportional to 138,809.70, 191,589 and 90,326.18 is: 124,670.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,809.70 : 191,589 = 90,326.18 : x
  2. Step 2: Convert to fraction form
    138,809.70/191,589 = 90,326.18/x
  3. Step 3: Cross multiply
    138,809.70x = 191,589 × 90,326.18
  4. Step 4: Simplify right side
    138,809.70x = 17,305,502,500.02
  5. Step 5: Solve for x
    x = 17,305,502,500.02/138,809.70
  6. Step 6: Final answer
    x = 124,670.70

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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.