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Finding the Fourth Proportional to 21,295.80, 31,943.70 and 8,814.11

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Solution

The fourth proportional to 21,295.80, 31,943.70 and 8,814.11 is: 13,221.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,295.80 : 31,943.70 = 8,814.11 : x
  2. Step 2: Convert to fraction form
    21,295.80/31,943.70 = 8,814.11/x
  3. Step 3: Cross multiply
    21,295.80x = 31,943.70 × 8,814.11
  4. Step 4: Simplify right side
    21,295.80x = 281,555,125.89
  5. Step 5: Solve for x
    x = 281,555,125.89/21,295.80
  6. Step 6: Final answer
    x = 13,221.16

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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.