Home / 21,055.81-31,566.94-12,161.05

Finding the Fourth Proportional to 21,055.81, 31,566.94 and 12,161.05

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Solution

The fourth proportional to 21,055.81, 31,566.94 and 12,161.05 is: 18,231.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,055.81 : 31,566.94 = 12,161.05 : x
  2. Step 2: Convert to fraction form
    21,055.81/31,566.94 = 12,161.05/x
  3. Step 3: Cross multiply
    21,055.81x = 31,566.94 × 12,161.05
  4. Step 4: Simplify right side
    21,055.81x = 383,887,135.69
  5. Step 5: Solve for x
    x = 383,887,135.69/21,055.81
  6. Step 6: Final answer
    x = 18,231.89

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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.