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Finding the Fourth Proportional to 81,487.35, 122,143.95 and 34,090.47

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Solution

The fourth proportional to 81,487.35, 122,143.95 and 34,090.47 is: 51,099.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,487.35 : 122,143.95 = 34,090.47 : x
  2. Step 2: Convert to fraction form
    81,487.35/122,143.95 = 34,090.47/x
  3. Step 3: Cross multiply
    81,487.35x = 122,143.95 × 34,090.47
  4. Step 4: Simplify right side
    81,487.35x = 4,163,944,663.16
  5. Step 5: Solve for x
    x = 4,163,944,663.16/81,487.35
  6. Step 6: Final answer
    x = 51,099.28

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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.