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Finding the Fourth Proportional to 81,410.61, 121,905.60 and 56,187.98

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Solution

The fourth proportional to 81,410.61, 121,905.60 and 56,187.98 is: 84,136.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,410.61 : 121,905.60 = 56,187.98 : x
  2. Step 2: Convert to fraction form
    81,410.61/121,905.60 = 56,187.98/x
  3. Step 3: Cross multiply
    81,410.61x = 121,905.60 × 56,187.98
  4. Step 4: Simplify right side
    81,410.61x = 6,849,629,414.69
  5. Step 5: Solve for x
    x = 6,849,629,414.69/81,410.61
  6. Step 6: Final answer
    x = 84,136.81

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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.