Home / 21,108.61-31,651.21-8,637.39

Finding the Fourth Proportional to 21,108.61, 31,651.21 and 8,637.39

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Solution

The fourth proportional to 21,108.61, 31,651.21 and 8,637.39 is: 12,951.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.61 : 31,651.21 = 8,637.39 : x
  2. Step 2: Convert to fraction form
    21,108.61/31,651.21 = 8,637.39/x
  3. Step 3: Cross multiply
    21,108.61x = 31,651.21 × 8,637.39
  4. Step 4: Simplify right side
    21,108.61x = 273,383,844.74
  5. Step 5: Solve for x
    x = 273,383,844.74/21,108.61
  6. Step 6: Final answer
    x = 12,951.30

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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.