Home / 20,539.78-28,339.68-12,579.10

Finding the Fourth Proportional to 20,539.78, 28,339.68 and 12,579.10

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Solution

The fourth proportional to 20,539.78, 28,339.68 and 12,579.10 is: 17,355.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,539.78 : 28,339.68 = 12,579.10 : x
  2. Step 2: Convert to fraction form
    20,539.78/28,339.68 = 12,579.10/x
  3. Step 3: Cross multiply
    20,539.78x = 28,339.68 × 12,579.10
  4. Step 4: Simplify right side
    20,539.78x = 356,487,668.69
  5. Step 5: Solve for x
    x = 356,487,668.69/20,539.78
  6. Step 6: Final answer
    x = 17,355.96

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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.