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Finding the Fourth Proportional to 25,187.20, 37,780.80 and 18,188.80

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Solution

The fourth proportional to 25,187.20, 37,780.80 and 18,188.80 is: 27,283.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,187.20 : 37,780.80 = 18,188.80 : x
  2. Step 2: Convert to fraction form
    25,187.20/37,780.80 = 18,188.80/x
  3. Step 3: Cross multiply
    25,187.20x = 37,780.80 × 18,188.80
  4. Step 4: Simplify right side
    25,187.20x = 687,187,415.04
  5. Step 5: Solve for x
    x = 687,187,415.04/25,187.20
  6. Step 6: Final answer
    x = 27,283.20

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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.