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Finding the Fourth Proportional to 20,428.52, 30,642.78 and 6,579.56

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Solution

The fourth proportional to 20,428.52, 30,642.78 and 6,579.56 is: 9,869.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.52 : 30,642.78 = 6,579.56 : x
  2. Step 2: Convert to fraction form
    20,428.52/30,642.78 = 6,579.56/x
  3. Step 3: Cross multiply
    20,428.52x = 30,642.78 × 6,579.56
  4. Step 4: Simplify right side
    20,428.52x = 201,616,009.58
  5. Step 5: Solve for x
    x = 201,616,009.58/20,428.52
  6. Step 6: Final answer
    x = 9,869.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.