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Finding the Fourth Proportional to 27,990.40, 41,995.20 and 12,419.20

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Solution

The fourth proportional to 27,990.40, 41,995.20 and 12,419.20 is: 18,633.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,990.40 : 41,995.20 = 12,419.20 : x
  2. Step 2: Convert to fraction form
    27,990.40/41,995.20 = 12,419.20/x
  3. Step 3: Cross multiply
    27,990.40x = 41,995.20 × 12,419.20
  4. Step 4: Simplify right side
    27,990.40x = 521,546,787.84
  5. Step 5: Solve for x
    x = 521,546,787.84/27,990.40
  6. Step 6: Final answer
    x = 18,633.06

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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.