Home / 20,318.40-28,040.64-11,366.96

Finding the Fourth Proportional to 20,318.40, 28,040.64 and 11,366.96

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Solution

The fourth proportional to 20,318.40, 28,040.64 and 11,366.96 is: 15,687.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,318.40 : 28,040.64 = 11,366.96 : x
  2. Step 2: Convert to fraction form
    20,318.40/28,040.64 = 11,366.96/x
  3. Step 3: Cross multiply
    20,318.40x = 28,040.64 × 11,366.96
  4. Step 4: Simplify right side
    20,318.40x = 318,736,833.25
  5. Step 5: Solve for x
    x = 318,736,833.25/20,318.40
  6. Step 6: Final answer
    x = 15,687.10

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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.