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Finding the Fourth Proportional to 85,855.70, 128,793.15 and 26,690.90

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Solution

The fourth proportional to 85,855.70, 128,793.15 and 26,690.90 is: 40,039.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,855.70 : 128,793.15 = 26,690.90 : x
  2. Step 2: Convert to fraction form
    85,855.70/128,793.15 = 26,690.90/x
  3. Step 3: Cross multiply
    85,855.70x = 128,793.15 × 26,690.90
  4. Step 4: Simplify right side
    85,855.70x = 3,437,605,087.34
  5. Step 5: Solve for x
    x = 3,437,605,087.34/85,855.70
  6. Step 6: Final answer
    x = 40,039.33

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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.