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Finding the Fourth Proportional to 28,755.78, 39,649.03 and 19,685.50

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Solution

The fourth proportional to 28,755.78, 39,649.03 and 19,685.50 is: 27,142.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,755.78 : 39,649.03 = 19,685.50 : x
  2. Step 2: Convert to fraction form
    28,755.78/39,649.03 = 19,685.50/x
  3. Step 3: Cross multiply
    28,755.78x = 39,649.03 × 19,685.50
  4. Step 4: Simplify right side
    28,755.78x = 780,510,831.73
  5. Step 5: Solve for x
    x = 780,510,831.73/28,755.78
  6. Step 6: Final answer
    x = 27,142.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.