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Finding the Fourth Proportional to 137,878.60, 206,817.90 and 90,639.40

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Solution

The fourth proportional to 137,878.60, 206,817.90 and 90,639.40 is: 135,959.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,878.60 : 206,817.90 = 90,639.40 : x
  2. Step 2: Convert to fraction form
    137,878.60/206,817.90 = 90,639.40/x
  3. Step 3: Cross multiply
    137,878.60x = 206,817.90 × 90,639.40
  4. Step 4: Simplify right side
    137,878.60x = 18,745,850,365.26
  5. Step 5: Solve for x
    x = 18,745,850,365.26/137,878.60
  6. Step 6: Final answer
    x = 135,959.10

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1.5x scale

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.