Home / 138,557.76-191,193.47-78,124.80

Finding the Fourth Proportional to 138,557.76, 191,193.47 and 78,124.80

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Solution

The fourth proportional to 138,557.76, 191,193.47 and 78,124.80 is: 107,803.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,557.76 : 191,193.47 = 78,124.80 : x
  2. Step 2: Convert to fraction form
    138,557.76/191,193.47 = 78,124.80/x
  3. Step 3: Cross multiply
    138,557.76x = 191,193.47 × 78,124.80
  4. Step 4: Simplify right side
    138,557.76x = 14,936,951,466.92
  5. Step 5: Solve for x
    x = 14,936,951,466.92/138,557.76
  6. Step 6: Final answer
    x = 107,803.07

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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.