Home / 20,511.64-28,320.24-15,723.28

Finding the Fourth Proportional to 20,511.64, 28,320.24 and 15,723.28

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Solution

The fourth proportional to 20,511.64, 28,320.24 and 15,723.28 is: 21,708.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.64 : 28,320.24 = 15,723.28 : x
  2. Step 2: Convert to fraction form
    20,511.64/28,320.24 = 15,723.28/x
  3. Step 3: Cross multiply
    20,511.64x = 28,320.24 × 15,723.28
  4. Step 4: Simplify right side
    20,511.64x = 445,287,063.19
  5. Step 5: Solve for x
    x = 445,287,063.19/20,511.64
  6. Step 6: Final answer
    x = 21,708.99

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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.