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Finding the Fourth Proportional to 25,953.39, 38,935.56 and 8,421.86

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Solution

The fourth proportional to 25,953.39, 38,935.56 and 8,421.86 is: 12,634.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,953.39 : 38,935.56 = 8,421.86 : x
  2. Step 2: Convert to fraction form
    25,953.39/38,935.56 = 8,421.86/x
  3. Step 3: Cross multiply
    25,953.39x = 38,935.56 × 8,421.86
  4. Step 4: Simplify right side
    25,953.39x = 327,909,640.66
  5. Step 5: Solve for x
    x = 327,909,640.66/25,953.39
  6. Step 6: Final answer
    x = 12,634.56

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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.