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Finding the Fourth Proportional to 18,139.20, 27,208.80 and 12,890.40

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Solution

The fourth proportional to 18,139.20, 27,208.80 and 12,890.40 is: 19,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,139.20 : 27,208.80 = 12,890.40 : x
  2. Step 2: Convert to fraction form
    18,139.20/27,208.80 = 12,890.40/x
  3. Step 3: Cross multiply
    18,139.20x = 27,208.80 × 12,890.40
  4. Step 4: Simplify right side
    18,139.20x = 350,732,315.52
  5. Step 5: Solve for x
    x = 350,732,315.52/18,139.20
  6. Step 6: Final answer
    x = 19,335.60

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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.