Home / 20,857.15-28,792.19-13,313.47

Finding the Fourth Proportional to 20,857.15, 28,792.19 and 13,313.47

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Solution

The fourth proportional to 20,857.15, 28,792.19 and 13,313.47 is: 18,378.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.15 : 28,792.19 = 13,313.47 : x
  2. Step 2: Convert to fraction form
    20,857.15/28,792.19 = 13,313.47/x
  3. Step 3: Cross multiply
    20,857.15x = 28,792.19 × 13,313.47
  4. Step 4: Simplify right side
    20,857.15x = 383,323,957.80
  5. Step 5: Solve for x
    x = 383,323,957.80/20,857.15
  6. Step 6: Final answer
    x = 18,378.54

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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.