Home / 20,520.81-28,318.30-11,568.15

Finding the Fourth Proportional to 20,520.81, 28,318.30 and 11,568.15

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Solution

The fourth proportional to 20,520.81, 28,318.30 and 11,568.15 is: 15,963.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520.81 : 28,318.30 = 11,568.15 : x
  2. Step 2: Convert to fraction form
    20,520.81/28,318.30 = 11,568.15/x
  3. Step 3: Cross multiply
    20,520.81x = 28,318.30 × 11,568.15
  4. Step 4: Simplify right side
    20,520.81x = 327,590,342.15
  5. Step 5: Solve for x
    x = 327,590,342.15/20,520.81
  6. Step 6: Final answer
    x = 15,963.81

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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.