Home / 20,665.91-28,532.68-15,877.32

Finding the Fourth Proportional to 20,665.91, 28,532.68 and 15,877.32

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Solution

The fourth proportional to 20,665.91, 28,532.68 and 15,877.32 is: 21,921.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.91 : 28,532.68 = 15,877.32 : x
  2. Step 2: Convert to fraction form
    20,665.91/28,532.68 = 15,877.32/x
  3. Step 3: Cross multiply
    20,665.91x = 28,532.68 × 15,877.32
  4. Step 4: Simplify right side
    20,665.91x = 453,022,490.82
  5. Step 5: Solve for x
    x = 453,022,490.82/20,665.91
  6. Step 6: Final answer
    x = 21,921.25

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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.