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Finding the Fourth Proportional to 21,276.56, 31,929.42 and 7,425.56

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Solution

The fourth proportional to 21,276.56, 31,929.42 and 7,425.56 is: 11,143.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,276.56 : 31,929.42 = 7,425.56 : x
  2. Step 2: Convert to fraction form
    21,276.56/31,929.42 = 7,425.56/x
  3. Step 3: Cross multiply
    21,276.56x = 31,929.42 × 7,425.56
  4. Step 4: Simplify right side
    21,276.56x = 237,093,823.98
  5. Step 5: Solve for x
    x = 237,093,823.98/21,276.56
  6. Step 6: Final answer
    x = 11,143.43

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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.