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Finding the Fourth Proportional to 21,069.60, 31,600.76 and 7,922.09

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Solution

The fourth proportional to 21,069.60, 31,600.76 and 7,922.09 is: 11,881.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,069.60 : 31,600.76 = 7,922.09 : x
  2. Step 2: Convert to fraction form
    21,069.60/31,600.76 = 7,922.09/x
  3. Step 3: Cross multiply
    21,069.60x = 31,600.76 × 7,922.09
  4. Step 4: Simplify right side
    21,069.60x = 250,343,867.17
  5. Step 5: Solve for x
    x = 250,343,867.17/21,069.60
  6. Step 6: Final answer
    x = 11,881.76

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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.