Home / 21,853.45-30,157.37-12,779.68

Finding the Fourth Proportional to 21,853.45, 30,157.37 and 12,779.68

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Solution

The fourth proportional to 21,853.45, 30,157.37 and 12,779.68 is: 17,635.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,853.45 : 30,157.37 = 12,779.68 : x
  2. Step 2: Convert to fraction form
    21,853.45/30,157.37 = 12,779.68/x
  3. Step 3: Cross multiply
    21,853.45x = 30,157.37 × 12,779.68
  4. Step 4: Simplify right side
    21,853.45x = 385,401,398.95
  5. Step 5: Solve for x
    x = 385,401,398.95/21,853.45
  6. Step 6: Final answer
    x = 17,635.73

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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.