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Finding the Fourth Proportional to 85,834.30, 128,751.45 and 50,404.90

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Solution

The fourth proportional to 85,834.30, 128,751.45 and 50,404.90 is: 75,607.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,834.30 : 128,751.45 = 50,404.90 : x
  2. Step 2: Convert to fraction form
    85,834.30/128,751.45 = 50,404.90/x
  3. Step 3: Cross multiply
    85,834.30x = 128,751.45 × 50,404.90
  4. Step 4: Simplify right side
    85,834.30x = 6,489,703,962.11
  5. Step 5: Solve for x
    x = 6,489,703,962.11/85,834.30
  6. Step 6: Final answer
    x = 75,607.35

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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.