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Finding the Fourth Proportional to 138,496.62, 191,122.64 and 78,066.12

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Solution

The fourth proportional to 138,496.62, 191,122.64 and 78,066.12 is: 107,729.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,496.62 : 191,122.64 = 78,066.12 : x
  2. Step 2: Convert to fraction form
    138,496.62/191,122.64 = 78,066.12/x
  3. Step 3: Cross multiply
    138,496.62x = 191,122.64 × 78,066.12
  4. Step 4: Simplify right side
    138,496.62x = 14,920,202,948.96
  5. Step 5: Solve for x
    x = 14,920,202,948.96/138,496.62
  6. Step 6: Final answer
    x = 107,729.73

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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.