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Finding the Fourth Proportional to 131,843.95, 181,913.13 and 78,119.68

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Solution

The fourth proportional to 131,843.95, 181,913.13 and 78,119.68 is: 107,786.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,843.95 : 181,913.13 = 78,119.68 : x
  2. Step 2: Convert to fraction form
    131,843.95/181,913.13 = 78,119.68/x
  3. Step 3: Cross multiply
    131,843.95x = 181,913.13 × 78,119.68
  4. Step 4: Simplify right side
    131,843.95x = 14,210,995,503.40
  5. Step 5: Solve for x
    x = 14,210,995,503.40/131,843.95
  6. Step 6: Final answer
    x = 107,786.48

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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.