Home / 15,911.52-21,939.20-12,917.92

Finding the Fourth Proportional to 15,911.52, 21,939.20 and 12,917.92

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Solution

The fourth proportional to 15,911.52, 21,939.20 and 12,917.92 is: 17,811.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,911.52 : 21,939.20 = 12,917.92 : x
  2. Step 2: Convert to fraction form
    15,911.52/21,939.20 = 12,917.92/x
  3. Step 3: Cross multiply
    15,911.52x = 21,939.20 × 12,917.92
  4. Step 4: Simplify right side
    15,911.52x = 283,408,830.46
  5. Step 5: Solve for x
    x = 283,408,830.46/15,911.52
  6. Step 6: Final answer
    x = 17,811.55

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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.