Home / 21,105.92-31,649.66-10,015.78

Finding the Fourth Proportional to 21,105.92, 31,649.66 and 10,015.78

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Solution

The fourth proportional to 21,105.92, 31,649.66 and 10,015.78 is: 15,019.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,105.92 : 31,649.66 = 10,015.78 : x
  2. Step 2: Convert to fraction form
    21,105.92/31,649.66 = 10,015.78/x
  3. Step 3: Cross multiply
    21,105.92x = 31,649.66 × 10,015.78
  4. Step 4: Simplify right side
    21,105.92x = 316,996,031.63
  5. Step 5: Solve for x
    x = 316,996,031.63/21,105.92
  6. Step 6: Final answer
    x = 15,019.29

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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.