Home / 28,920.48-39,919.28-18,831.20

Finding the Fourth Proportional to 28,920.48, 39,919.28 and 18,831.20

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Solution

The fourth proportional to 28,920.48, 39,919.28 and 18,831.20 is: 25,992.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,920.48 : 39,919.28 = 18,831.20 : x
  2. Step 2: Convert to fraction form
    28,920.48/39,919.28 = 18,831.20/x
  3. Step 3: Cross multiply
    28,920.48x = 39,919.28 × 18,831.20
  4. Step 4: Simplify right side
    28,920.48x = 751,727,945.54
  5. Step 5: Solve for x
    x = 751,727,945.54/28,920.48
  6. Step 6: Final answer
    x = 25,992.93

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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.