Home / 28,578.20-39,438.08-15,831.78

Finding the Fourth Proportional to 28,578.20, 39,438.08 and 15,831.78

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Solution

The fourth proportional to 28,578.20, 39,438.08 and 15,831.78 is: 21,847.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,578.20 : 39,438.08 = 15,831.78 : x
  2. Step 2: Convert to fraction form
    28,578.20/39,438.08 = 15,831.78/x
  3. Step 3: Cross multiply
    28,578.20x = 39,438.08 × 15,831.78
  4. Step 4: Simplify right side
    28,578.20x = 624,374,927.02
  5. Step 5: Solve for x
    x = 624,374,927.02/28,578.20
  6. Step 6: Final answer
    x = 21,847.95

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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.