Home / 21,213.40-31,820.10-12,909.70

Finding the Fourth Proportional to 21,213.40, 31,820.10 and 12,909.70

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Solution

The fourth proportional to 21,213.40, 31,820.10 and 12,909.70 is: 19,364.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,213.40 : 31,820.10 = 12,909.70 : x
  2. Step 2: Convert to fraction form
    21,213.40/31,820.10 = 12,909.70/x
  3. Step 3: Cross multiply
    21,213.40x = 31,820.10 × 12,909.70
  4. Step 4: Simplify right side
    21,213.40x = 410,787,944.97
  5. Step 5: Solve for x
    x = 410,787,944.97/21,213.40
  6. Step 6: Final answer
    x = 19,364.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.