Home / 138,707.96-191,416.92-78,291.28

Finding the Fourth Proportional to 138,707.96, 191,416.92 and 78,291.28

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Solution

The fourth proportional to 138,707.96, 191,416.92 and 78,291.28 is: 108,041.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,707.96 : 191,416.92 = 78,291.28 : x
  2. Step 2: Convert to fraction form
    138,707.96/191,416.92 = 78,291.28/x
  3. Step 3: Cross multiply
    138,707.96x = 191,416.92 × 78,291.28
  4. Step 4: Simplify right side
    138,707.96x = 14,986,275,680.46
  5. Step 5: Solve for x
    x = 14,986,275,680.46/138,707.96
  6. Step 6: Final answer
    x = 108,041.93

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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.