Home / 20,881.08-28,821.42-12,918.78

Finding the Fourth Proportional to 20,881.08, 28,821.42 and 12,918.78

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Solution

The fourth proportional to 20,881.08, 28,821.42 and 12,918.78 is: 17,831.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.08 : 28,821.42 = 12,918.78 : x
  2. Step 2: Convert to fraction form
    20,881.08/28,821.42 = 12,918.78/x
  3. Step 3: Cross multiply
    20,881.08x = 28,821.42 × 12,918.78
  4. Step 4: Simplify right side
    20,881.08x = 372,337,584.27
  5. Step 5: Solve for x
    x = 372,337,584.27/20,881.08
  6. Step 6: Final answer
    x = 17,831.34

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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.