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Finding the Fourth Proportional to 21,141.55, 31,713.80 and 8,491.30

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Solution

The fourth proportional to 21,141.55, 31,713.80 and 8,491.30 is: 12,737.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,141.55 : 31,713.80 = 8,491.30 : x
  2. Step 2: Convert to fraction form
    21,141.55/31,713.80 = 8,491.30/x
  3. Step 3: Cross multiply
    21,141.55x = 31,713.80 × 8,491.30
  4. Step 4: Simplify right side
    21,141.55x = 269,291,426.77
  5. Step 5: Solve for x
    x = 269,291,426.77/21,141.55
  6. Step 6: Final answer
    x = 12,737.55

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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.