Home / 100,131.82-138,182.12-54,812.70

Finding the Fourth Proportional to 100,131.82, 138,182.12 and 54,812.70

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Solution

The fourth proportional to 100,131.82, 138,182.12 and 54,812.70 is: 75,641.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,131.82 : 138,182.12 = 54,812.70 : x
  2. Step 2: Convert to fraction form
    100,131.82/138,182.12 = 54,812.70/x
  3. Step 3: Cross multiply
    100,131.82x = 138,182.12 × 54,812.70
  4. Step 4: Simplify right side
    100,131.82x = 7,574,135,088.92
  5. Step 5: Solve for x
    x = 7,574,135,088.92/100,131.82
  6. Step 6: Final answer
    x = 75,641.64

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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.