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Finding the Fourth Proportional to 69,912, 104,885.28 and 20,664

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Solution

The fourth proportional to 69,912, 104,885.28 and 20,664 is: 31,001.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,912 : 104,885.28 = 20,664 : x
  2. Step 2: Convert to fraction form
    69,912/104,885.28 = 20,664/x
  3. Step 3: Cross multiply
    69,912x = 104,885.28 × 20,664
  4. Step 4: Simplify right side
    69,912x = 2,167,349,425.92
  5. Step 5: Solve for x
    x = 2,167,349,425.92/69,912
  6. Step 6: Final answer
    x = 31,001.11

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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.