Home / 138,623.86-191,303.69-78,182.65

Finding the Fourth Proportional to 138,623.86, 191,303.69 and 78,182.65

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Solution

The fourth proportional to 138,623.86, 191,303.69 and 78,182.65 is: 107,893.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,623.86 : 191,303.69 = 78,182.65 : x
  2. Step 2: Convert to fraction form
    138,623.86/191,303.69 = 78,182.65/x
  3. Step 3: Cross multiply
    138,623.86x = 191,303.69 × 78,182.65
  4. Step 4: Simplify right side
    138,623.86x = 14,956,629,438.98
  5. Step 5: Solve for x
    x = 14,956,629,438.98/138,623.86
  6. Step 6: Final answer
    x = 107,893.62

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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.