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Finding the Fourth Proportional to 25,991.60, 39,000.90 and 12,140.60

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Solution

The fourth proportional to 25,991.60, 39,000.90 and 12,140.60 is: 18,217.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,991.60 : 39,000.90 = 12,140.60 : x
  2. Step 2: Convert to fraction form
    25,991.60/39,000.90 = 12,140.60/x
  3. Step 3: Cross multiply
    25,991.60x = 39,000.90 × 12,140.60
  4. Step 4: Simplify right side
    25,991.60x = 473,494,326.54
  5. Step 5: Solve for x
    x = 473,494,326.54/25,991.60
  6. Step 6: Final answer
    x = 18,217.21

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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.