Home / 21,820.86-30,111.64-12,261.12

Finding the Fourth Proportional to 21,820.86, 30,111.64 and 12,261.12

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Solution

The fourth proportional to 21,820.86, 30,111.64 and 12,261.12 is: 16,919.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820.86 : 30,111.64 = 12,261.12 : x
  2. Step 2: Convert to fraction form
    21,820.86/30,111.64 = 12,261.12/x
  3. Step 3: Cross multiply
    21,820.86x = 30,111.64 × 12,261.12
  4. Step 4: Simplify right side
    21,820.86x = 369,202,370.13
  5. Step 5: Solve for x
    x = 369,202,370.13/21,820.86
  6. Step 6: Final answer
    x = 16,919.70

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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.