Home / 15,408.78-21,228.08-12,747.92

Finding the Fourth Proportional to 15,408.78, 21,228.08 and 12,747.92

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Solution

The fourth proportional to 15,408.78, 21,228.08 and 12,747.92 is: 17,562.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,408.78 : 21,228.08 = 12,747.92 : x
  2. Step 2: Convert to fraction form
    15,408.78/21,228.08 = 12,747.92/x
  3. Step 3: Cross multiply
    15,408.78x = 21,228.08 × 12,747.92
  4. Step 4: Simplify right side
    15,408.78x = 270,613,865.59
  5. Step 5: Solve for x
    x = 270,613,865.59/15,408.78
  6. Step 6: Final answer
    x = 17,562.32

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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.