Home / 138,558.76-191,194.85-78,125.81

Finding the Fourth Proportional to 138,558.76, 191,194.85 and 78,125.81

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Solution

The fourth proportional to 138,558.76, 191,194.85 and 78,125.81 is: 107,804.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,558.76 : 191,194.85 = 78,125.81 : x
  2. Step 2: Convert to fraction form
    138,558.76/191,194.85 = 78,125.81/x
  3. Step 3: Cross multiply
    138,558.76x = 191,194.85 × 78,125.81
  4. Step 4: Simplify right side
    138,558.76x = 14,937,251,568.10
  5. Step 5: Solve for x
    x = 14,937,251,568.10/138,558.76
  6. Step 6: Final answer
    x = 107,804.45

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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.