Home / 12,789.20-17,667.24-12,400.40

Finding the Fourth Proportional to 12,789.20, 17,667.24 and 12,400.40

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Solution

The fourth proportional to 12,789.20, 17,667.24 and 12,400.40 is: 17,130.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,789.20 : 17,667.24 = 12,400.40 : x
  2. Step 2: Convert to fraction form
    12,789.20/17,667.24 = 12,400.40/x
  3. Step 3: Cross multiply
    12,789.20x = 17,667.24 × 12,400.40
  4. Step 4: Simplify right side
    12,789.20x = 219,080,842.90
  5. Step 5: Solve for x
    x = 219,080,842.90/12,789.20
  6. Step 6: Final answer
    x = 17,130.14

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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.