Home / 138,380.09-190,939.14-77,937.80

Finding the Fourth Proportional to 138,380.09, 190,939.14 and 77,937.80

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Solution

The fourth proportional to 138,380.09, 190,939.14 and 77,937.80 is: 107,539.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,380.09 : 190,939.14 = 77,937.80 : x
  2. Step 2: Convert to fraction form
    138,380.09/190,939.14 = 77,937.80/x
  3. Step 3: Cross multiply
    138,380.09x = 190,939.14 × 77,937.80
  4. Step 4: Simplify right side
    138,380.09x = 14,881,376,505.49
  5. Step 5: Solve for x
    x = 14,881,376,505.49/138,380.09
  6. Step 6: Final answer
    x = 107,539.87

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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.