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Finding the Fourth Proportional to 85,843.55, 128,784.90 and 26,685.20

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Solution

The fourth proportional to 85,843.55, 128,784.90 and 26,685.20 is: 40,033.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,843.55 : 128,784.90 = 26,685.20 : x
  2. Step 2: Convert to fraction form
    85,843.55/128,784.90 = 26,685.20/x
  3. Step 3: Cross multiply
    85,843.55x = 128,784.90 × 26,685.20
  4. Step 4: Simplify right side
    85,843.55x = 3,436,650,813.48
  5. Step 5: Solve for x
    x = 3,436,650,813.48/85,843.55
  6. Step 6: Final answer
    x = 40,033.89

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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.