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Finding the Fourth Proportional to 138,426.30, 207,639.45 and 135,801.90

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Solution

The fourth proportional to 138,426.30, 207,639.45 and 135,801.90 is: 203,702.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,426.30 : 207,639.45 = 135,801.90 : x
  2. Step 2: Convert to fraction form
    138,426.30/207,639.45 = 135,801.90/x
  3. Step 3: Cross multiply
    138,426.30x = 207,639.45 × 135,801.90
  4. Step 4: Simplify right side
    138,426.30x = 28,197,831,824.96
  5. Step 5: Solve for x
    x = 28,197,831,824.96/138,426.30
  6. Step 6: Final answer
    x = 203,702.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.