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Finding the Fourth Proportional to 138,767.75, 191,504.15 and 85,042.40

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Solution

The fourth proportional to 138,767.75, 191,504.15 and 85,042.40 is: 117,361.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,767.75 : 191,504.15 = 85,042.40 : x
  2. Step 2: Convert to fraction form
    138,767.75/191,504.15 = 85,042.40/x
  3. Step 3: Cross multiply
    138,767.75x = 191,504.15 × 85,042.40
  4. Step 4: Simplify right side
    138,767.75x = 16,285,971,143.23
  5. Step 5: Solve for x
    x = 16,285,971,143.23/138,767.75
  6. Step 6: Final answer
    x = 117,361.35

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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.