Home / 21,931.56-30,263.22-12,979.44

Finding the Fourth Proportional to 21,931.56, 30,263.22 and 12,979.44

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Solution

The fourth proportional to 21,931.56, 30,263.22 and 12,979.44 is: 17,910.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,931.56 : 30,263.22 = 12,979.44 : x
  2. Step 2: Convert to fraction form
    21,931.56/30,263.22 = 12,979.44/x
  3. Step 3: Cross multiply
    21,931.56x = 30,263.22 × 12,979.44
  4. Step 4: Simplify right side
    21,931.56x = 392,799,648.20
  5. Step 5: Solve for x
    x = 392,799,648.20/21,931.56
  6. Step 6: Final answer
    x = 17,910.25

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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.