Home / 100,450.19-138,620.81-55,128.93

Finding the Fourth Proportional to 100,450.19, 138,620.81 and 55,128.93

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Solution

The fourth proportional to 100,450.19, 138,620.81 and 55,128.93 is: 76,077.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,450.19 : 138,620.81 = 55,128.93 : x
  2. Step 2: Convert to fraction form
    100,450.19/138,620.81 = 55,128.93/x
  3. Step 3: Cross multiply
    100,450.19x = 138,620.81 × 55,128.93
  4. Step 4: Simplify right side
    100,450.19x = 7,642,016,655.39
  5. Step 5: Solve for x
    x = 7,642,016,655.39/100,450.19
  6. Step 6: Final answer
    x = 76,077.68

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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.