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Finding the Fourth Proportional to 81,424.30, 122,136.45 and 81,424.30

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Solution

The fourth proportional to 81,424.30, 122,136.45 and 81,424.30 is: 122,136.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,424.30 : 122,136.45 = 81,424.30 : x
  2. Step 2: Convert to fraction form
    81,424.30/122,136.45 = 81,424.30/x
  3. Step 3: Cross multiply
    81,424.30x = 122,136.45 × 81,424.30
  4. Step 4: Simplify right side
    81,424.30x = 9,944,874,945.74
  5. Step 5: Solve for x
    x = 9,944,874,945.74/81,424.30
  6. Step 6: Final answer
    x = 122,136.45

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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.