Home / 20,865.52-31,266.84-12,536.40

Finding the Fourth Proportional to 20,865.52, 31,266.84 and 12,536.40

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Solution

The fourth proportional to 20,865.52, 31,266.84 and 12,536.40 is: 18,785.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.52 : 31,266.84 = 12,536.40 : x
  2. Step 2: Convert to fraction form
    20,865.52/31,266.84 = 12,536.40/x
  3. Step 3: Cross multiply
    20,865.52x = 31,266.84 × 12,536.40
  4. Step 4: Simplify right side
    20,865.52x = 391,973,612.98
  5. Step 5: Solve for x
    x = 391,973,612.98/20,865.52
  6. Step 6: Final answer
    x = 18,785.71

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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.