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Finding the Fourth Proportional to 66,889.76, 100,309.53 and 21,900.74

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Solution

The fourth proportional to 66,889.76, 100,309.53 and 21,900.74 is: 32,842.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,889.76 : 100,309.53 = 21,900.74 : x
  2. Step 2: Convert to fraction form
    66,889.76/100,309.53 = 21,900.74/x
  3. Step 3: Cross multiply
    66,889.76x = 100,309.53 × 21,900.74
  4. Step 4: Simplify right side
    66,889.76x = 2,196,852,936.05
  5. Step 5: Solve for x
    x = 2,196,852,936.05/66,889.76
  6. Step 6: Final answer
    x = 32,842.89

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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.