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Finding the Fourth Proportional to 39,149.60, 58,724.40 and 12,855.20

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Solution

The fourth proportional to 39,149.60, 58,724.40 and 12,855.20 is: 19,282.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,149.60 : 58,724.40 = 12,855.20 : x
  2. Step 2: Convert to fraction form
    39,149.60/58,724.40 = 12,855.20/x
  3. Step 3: Cross multiply
    39,149.60x = 58,724.40 × 12,855.20
  4. Step 4: Simplify right side
    39,149.60x = 754,913,906.88
  5. Step 5: Solve for x
    x = 754,913,906.88/39,149.60
  6. Step 6: Final answer
    x = 19,282.80

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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.