Home / 138,664.72-191,357.34-78,248.20

Finding the Fourth Proportional to 138,664.72, 191,357.34 and 78,248.20

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Solution

The fourth proportional to 138,664.72, 191,357.34 and 78,248.20 is: 107,982.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,664.72 : 191,357.34 = 78,248.20 : x
  2. Step 2: Convert to fraction form
    138,664.72/191,357.34 = 78,248.20/x
  3. Step 3: Cross multiply
    138,664.72x = 191,357.34 × 78,248.20
  4. Step 4: Simplify right side
    138,664.72x = 14,973,367,411.79
  5. Step 5: Solve for x
    x = 14,973,367,411.79/138,664.72
  6. Step 6: Final answer
    x = 107,982.53

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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.