Home / 100,739.16-138,814.86-77,939.64

Finding the Fourth Proportional to 100,739.16, 138,814.86 and 77,939.64

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Solution

The fourth proportional to 100,739.16, 138,814.86 and 77,939.64 is: 107,397.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,739.16 : 138,814.86 = 77,939.64 : x
  2. Step 2: Convert to fraction form
    100,739.16/138,814.86 = 77,939.64/x
  3. Step 3: Cross multiply
    100,739.16x = 138,814.86 × 77,939.64
  4. Step 4: Simplify right side
    100,739.16x = 10,819,180,215.05
  5. Step 5: Solve for x
    x = 10,819,180,215.05/100,739.16
  6. Step 6: Final answer
    x = 107,397.96

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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.