Home / 138,667.09-191,344.13-78,234.21

Finding the Fourth Proportional to 138,667.09, 191,344.13 and 78,234.21

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Solution

The fourth proportional to 138,667.09, 191,344.13 and 78,234.21 is: 107,953.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,667.09 : 191,344.13 = 78,234.21 : x
  2. Step 2: Convert to fraction form
    138,667.09/191,344.13 = 78,234.21/x
  3. Step 3: Cross multiply
    138,667.09x = 191,344.13 × 78,234.21
  4. Step 4: Simplify right side
    138,667.09x = 14,969,656,848.69
  5. Step 5: Solve for x
    x = 14,969,656,848.69/138,667.09
  6. Step 6: Final answer
    x = 107,953.93

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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.