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Finding the Fourth Proportional to 74,420.60, 111,645.30 and 21,831.80

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Solution

The fourth proportional to 74,420.60, 111,645.30 and 21,831.80 is: 32,751.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,420.60 : 111,645.30 = 21,831.80 : x
  2. Step 2: Convert to fraction form
    74,420.60/111,645.30 = 21,831.80/x
  3. Step 3: Cross multiply
    74,420.60x = 111,645.30 × 21,831.80
  4. Step 4: Simplify right side
    74,420.60x = 2,437,417,860.54
  5. Step 5: Solve for x
    x = 2,437,417,860.54/74,420.60
  6. Step 6: Final answer
    x = 32,751.92

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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.