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Finding the Fourth Proportional to 21,124.64, 31,686.92 and 8,650.48

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Solution

The fourth proportional to 21,124.64, 31,686.92 and 8,650.48 is: 12,975.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,124.64 : 31,686.92 = 8,650.48 : x
  2. Step 2: Convert to fraction form
    21,124.64/31,686.92 = 8,650.48/x
  3. Step 3: Cross multiply
    21,124.64x = 31,686.92 × 8,650.48
  4. Step 4: Simplify right side
    21,124.64x = 274,107,067.72
  5. Step 5: Solve for x
    x = 274,107,067.72/21,124.64
  6. Step 6: Final answer
    x = 12,975.70

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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.