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Finding the Fourth Proportional to 25,385.74, 34,998.74 and 20,831.74

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Solution

The fourth proportional to 25,385.74, 34,998.74 and 20,831.74 is: 28,720.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,385.74 : 34,998.74 = 20,831.74 : x
  2. Step 2: Convert to fraction form
    25,385.74/34,998.74 = 20,831.74/x
  3. Step 3: Cross multiply
    25,385.74x = 34,998.74 × 20,831.74
  4. Step 4: Simplify right side
    25,385.74x = 729,084,652.01
  5. Step 5: Solve for x
    x = 729,084,652.01/25,385.74
  6. Step 6: Final answer
    x = 28,720.24

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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.