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Finding the Fourth Proportional to 21,750.71, 32,639.02 and 7,900.79

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Solution

The fourth proportional to 21,750.71, 32,639.02 and 7,900.79 is: 11,855.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,750.71 : 32,639.02 = 7,900.79 : x
  2. Step 2: Convert to fraction form
    21,750.71/32,639.02 = 7,900.79/x
  3. Step 3: Cross multiply
    21,750.71x = 32,639.02 × 7,900.79
  4. Step 4: Simplify right side
    21,750.71x = 257,873,859.88
  5. Step 5: Solve for x
    x = 257,873,859.88/21,750.71
  6. Step 6: Final answer
    x = 11,855.89

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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.