Home / 138,391.81-190,979.84-77,981.92

Finding the Fourth Proportional to 138,391.81, 190,979.84 and 77,981.92

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Solution

The fourth proportional to 138,391.81, 190,979.84 and 77,981.92 is: 107,614.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,391.81 : 190,979.84 = 77,981.92 : x
  2. Step 2: Convert to fraction form
    138,391.81/190,979.84 = 77,981.92/x
  3. Step 3: Cross multiply
    138,391.81x = 190,979.84 × 77,981.92
  4. Step 4: Simplify right side
    138,391.81x = 14,892,973,259.68
  5. Step 5: Solve for x
    x = 14,892,973,259.68/138,391.81
  6. Step 6: Final answer
    x = 107,614.56

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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.