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Finding the Fourth Proportional to 138,674.80, 191,349.84 and 78,240.70

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Solution

The fourth proportional to 138,674.80, 191,349.84 and 78,240.70 is: 107,960.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,674.80 : 191,349.84 = 78,240.70 : x
  2. Step 2: Convert to fraction form
    138,674.80/191,349.84 = 78,240.70/x
  3. Step 3: Cross multiply
    138,674.80x = 191,349.84 × 78,240.70
  4. Step 4: Simplify right side
    138,674.80x = 14,971,345,426.49
  5. Step 5: Solve for x
    x = 14,971,345,426.49/138,674.80
  6. Step 6: Final answer
    x = 107,960.10

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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.