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Finding the Fourth Proportional to 85,862.97, 128,825.10 and 52,197.48

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Solution

The fourth proportional to 85,862.97, 128,825.10 and 52,197.48 is: 78,314.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,862.97 : 128,825.10 = 52,197.48 : x
  2. Step 2: Convert to fraction form
    85,862.97/128,825.10 = 52,197.48/x
  3. Step 3: Cross multiply
    85,862.97x = 128,825.10 × 52,197.48
  4. Step 4: Simplify right side
    85,862.97x = 6,724,345,580.75
  5. Step 5: Solve for x
    x = 6,724,345,580.75/85,862.97
  6. Step 6: Final answer
    x = 78,314.85

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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.