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Finding the Fourth Proportional to 21,336.98, 31,943.47 and 12,425.11

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Solution

The fourth proportional to 21,336.98, 31,943.47 and 12,425.11 is: 18,601.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,336.98 : 31,943.47 = 12,425.11 : x
  2. Step 2: Convert to fraction form
    21,336.98/31,943.47 = 12,425.11/x
  3. Step 3: Cross multiply
    21,336.98x = 31,943.47 × 12,425.11
  4. Step 4: Simplify right side
    21,336.98x = 396,901,066.41
  5. Step 5: Solve for x
    x = 396,901,066.41/21,336.98
  6. Step 6: Final answer
    x = 18,601.56

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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.