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Finding the Fourth Proportional to 135,705.40, 203,558.10 and 85,841.80

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Solution

The fourth proportional to 135,705.40, 203,558.10 and 85,841.80 is: 128,762.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,705.40 : 203,558.10 = 85,841.80 : x
  2. Step 2: Convert to fraction form
    135,705.40/203,558.10 = 85,841.80/x
  3. Step 3: Cross multiply
    135,705.40x = 203,558.10 × 85,841.80
  4. Step 4: Simplify right side
    135,705.40x = 17,473,793,708.58
  5. Step 5: Solve for x
    x = 17,473,793,708.58/135,705.40
  6. Step 6: Final answer
    x = 128,762.70

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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.