Home / 138,712.91-191,412.92-78,298.25

Finding the Fourth Proportional to 138,712.91, 191,412.92 and 78,298.25

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Solution

The fourth proportional to 138,712.91, 191,412.92 and 78,298.25 is: 108,045.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,712.91 : 191,412.92 = 78,298.25 : x
  2. Step 2: Convert to fraction form
    138,712.91/191,412.92 = 78,298.25/x
  3. Step 3: Cross multiply
    138,712.91x = 191,412.92 × 78,298.25
  4. Step 4: Simplify right side
    138,712.91x = 14,987,295,902.07
  5. Step 5: Solve for x
    x = 14,987,295,902.07/138,712.91
  6. Step 6: Final answer
    x = 108,045.43

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1.5x scale

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.