Home / 138,621.51-191,289.72-78,188.55

Finding the Fourth Proportional to 138,621.51, 191,289.72 and 78,188.55

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Solution

The fourth proportional to 138,621.51, 191,289.72 and 78,188.55 is: 107,895.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,621.51 : 191,289.72 = 78,188.55 : x
  2. Step 2: Convert to fraction form
    138,621.51/191,289.72 = 78,188.55/x
  3. Step 3: Cross multiply
    138,621.51x = 191,289.72 × 78,188.55
  4. Step 4: Simplify right side
    138,621.51x = 14,956,665,836.71
  5. Step 5: Solve for x
    x = 14,956,665,836.71/138,621.51
  6. Step 6: Final answer
    x = 107,895.71

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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.