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Finding the Fourth Proportional to 85,404.90, 128,107.35 and 53,912.10

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Solution

The fourth proportional to 85,404.90, 128,107.35 and 53,912.10 is: 80,868.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,404.90 : 128,107.35 = 53,912.10 : x
  2. Step 2: Convert to fraction form
    85,404.90/128,107.35 = 53,912.10/x
  3. Step 3: Cross multiply
    85,404.90x = 128,107.35 × 53,912.10
  4. Step 4: Simplify right side
    85,404.90x = 6,906,536,263.94
  5. Step 5: Solve for x
    x = 6,906,536,263.94/85,404.90
  6. Step 6: Final answer
    x = 80,868.15

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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.