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Finding the Fourth Proportional to 25,990.60, 38,999.40 and 12,139.60

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Solution

The fourth proportional to 25,990.60, 38,999.40 and 12,139.60 is: 18,215.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,990.60 : 38,999.40 = 12,139.60 : x
  2. Step 2: Convert to fraction form
    25,990.60/38,999.40 = 12,139.60/x
  3. Step 3: Cross multiply
    25,990.60x = 38,999.40 × 12,139.60
  4. Step 4: Simplify right side
    25,990.60x = 473,437,116.24
  5. Step 5: Solve for x
    x = 473,437,116.24/25,990.60
  6. Step 6: Final answer
    x = 18,215.71

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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.