Home / 21,161.72-31,820.34-20,306.36

Finding the Fourth Proportional to 21,161.72, 31,820.34 and 20,306.36

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Solution

The fourth proportional to 21,161.72, 31,820.34 and 20,306.36 is: 30,534.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161.72 : 31,820.34 = 20,306.36 : x
  2. Step 2: Convert to fraction form
    21,161.72/31,820.34 = 20,306.36/x
  3. Step 3: Cross multiply
    21,161.72x = 31,820.34 × 20,306.36
  4. Step 4: Simplify right side
    21,161.72x = 646,155,279.36
  5. Step 5: Solve for x
    x = 646,155,279.36/21,161.72
  6. Step 6: Final answer
    x = 30,534.16

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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.