Home / 20,829.84-28,745.16-11,398.40

Finding the Fourth Proportional to 20,829.84, 28,745.16 and 11,398.40

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Solution

The fourth proportional to 20,829.84, 28,745.16 and 11,398.40 is: 15,729.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,829.84 : 28,745.16 = 11,398.40 : x
  2. Step 2: Convert to fraction form
    20,829.84/28,745.16 = 11,398.40/x
  3. Step 3: Cross multiply
    20,829.84x = 28,745.16 × 11,398.40
  4. Step 4: Simplify right side
    20,829.84x = 327,648,831.74
  5. Step 5: Solve for x
    x = 327,648,831.74/20,829.84
  6. Step 6: Final answer
    x = 15,729.78

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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.