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Finding the Fourth Proportional to 138,903.60, 191,680.62 and 85,179.96

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Solution

The fourth proportional to 138,903.60, 191,680.62 and 85,179.96 is: 117,544.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,903.60 : 191,680.62 = 85,179.96 : x
  2. Step 2: Convert to fraction form
    138,903.60/191,680.62 = 85,179.96/x
  3. Step 3: Cross multiply
    138,903.60x = 191,680.62 × 85,179.96
  4. Step 4: Simplify right side
    138,903.60x = 16,327,347,544.38
  5. Step 5: Solve for x
    x = 16,327,347,544.38/138,903.60
  6. Step 6: Final answer
    x = 117,544.45

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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.