Home / 139,973.18-193,165.88-78,720.54

Finding the Fourth Proportional to 139,973.18, 193,165.88 and 78,720.54

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Solution

The fourth proportional to 139,973.18, 193,165.88 and 78,720.54 is: 108,635.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,973.18 : 193,165.88 = 78,720.54 : x
  2. Step 2: Convert to fraction form
    139,973.18/193,165.88 = 78,720.54/x
  3. Step 3: Cross multiply
    139,973.18x = 193,165.88 × 78,720.54
  4. Step 4: Simplify right side
    139,973.18x = 15,206,121,708.00
  5. Step 5: Solve for x
    x = 15,206,121,708.00/139,973.18
  6. Step 6: Final answer
    x = 108,635.97

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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.