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Finding the Fourth Proportional to 18,272.40, 27,430.20 and 18,142.80

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Solution

The fourth proportional to 18,272.40, 27,430.20 and 18,142.80 is: 27,235.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,272.40 : 27,430.20 = 18,142.80 : x
  2. Step 2: Convert to fraction form
    18,272.40/27,430.20 = 18,142.80/x
  3. Step 3: Cross multiply
    18,272.40x = 27,430.20 × 18,142.80
  4. Step 4: Simplify right side
    18,272.40x = 497,660,632.56
  5. Step 5: Solve for x
    x = 497,660,632.56/18,272.40
  6. Step 6: Final answer
    x = 27,235.65

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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.