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Finding the Fourth Proportional to 21,274.80, 31,912.28 and 7,423.80

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Solution

The fourth proportional to 21,274.80, 31,912.28 and 7,423.80 is: 11,135.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,274.80 : 31,912.28 = 7,423.80 : x
  2. Step 2: Convert to fraction form
    21,274.80/31,912.28 = 7,423.80/x
  3. Step 3: Cross multiply
    21,274.80x = 31,912.28 × 7,423.80
  4. Step 4: Simplify right side
    21,274.80x = 236,910,384.26
  5. Step 5: Solve for x
    x = 236,910,384.26/21,274.80
  6. Step 6: Final answer
    x = 11,135.73

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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.