Home / 20,789.79-28,690.95-12,720.92

Finding the Fourth Proportional to 20,789.79, 28,690.95 and 12,720.92

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Solution

The fourth proportional to 20,789.79, 28,690.95 and 12,720.92 is: 17,555.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.79 : 28,690.95 = 12,720.92 : x
  2. Step 2: Convert to fraction form
    20,789.79/28,690.95 = 12,720.92/x
  3. Step 3: Cross multiply
    20,789.79x = 28,690.95 × 12,720.92
  4. Step 4: Simplify right side
    20,789.79x = 364,975,176.14
  5. Step 5: Solve for x
    x = 364,975,176.14/20,789.79
  6. Step 6: Final answer
    x = 17,555.50

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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.