Home / 138,727.86-191,445.10-78,301.05

Finding the Fourth Proportional to 138,727.86, 191,445.10 and 78,301.05

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Solution

The fourth proportional to 138,727.86, 191,445.10 and 78,301.05 is: 108,055.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,727.86 : 191,445.10 = 78,301.05 : x
  2. Step 2: Convert to fraction form
    138,727.86/191,445.10 = 78,301.05/x
  3. Step 3: Cross multiply
    138,727.86x = 191,445.10 × 78,301.05
  4. Step 4: Simplify right side
    138,727.86x = 14,990,352,086.27
  5. Step 5: Solve for x
    x = 14,990,352,086.27/138,727.86
  6. Step 6: Final answer
    x = 108,055.82

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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.