Home / 21,161.16-31,791.12-18,208.80

Finding the Fourth Proportional to 21,161.16, 31,791.12 and 18,208.80

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Solution

The fourth proportional to 21,161.16, 31,791.12 and 18,208.80 is: 27,355.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161.16 : 31,791.12 = 18,208.80 : x
  2. Step 2: Convert to fraction form
    21,161.16/31,791.12 = 18,208.80/x
  3. Step 3: Cross multiply
    21,161.16x = 31,791.12 × 18,208.80
  4. Step 4: Simplify right side
    21,161.16x = 578,878,145.86
  5. Step 5: Solve for x
    x = 578,878,145.86/21,161.16
  6. Step 6: Final answer
    x = 27,355.69

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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.