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Finding the Fourth Proportional to 138,771.70, 191,505.63 and 78,344.80

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Solution

The fourth proportional to 138,771.70, 191,505.63 and 78,344.80 is: 108,116.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,771.70 : 191,505.63 = 78,344.80 : x
  2. Step 2: Convert to fraction form
    138,771.70/191,505.63 = 78,344.80/x
  3. Step 3: Cross multiply
    138,771.70x = 191,505.63 × 78,344.80
  4. Step 4: Simplify right side
    138,771.70x = 15,003,470,281.22
  5. Step 5: Solve for x
    x = 15,003,470,281.22/138,771.70
  6. Step 6: Final answer
    x = 108,116.21

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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.