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Finding the Fourth Proportional to 128,712.36, 192,978.92 and 56,630.36

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Solution

The fourth proportional to 128,712.36, 192,978.92 and 56,630.36 is: 84,906.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,712.36 : 192,978.92 = 56,630.36 : x
  2. Step 2: Convert to fraction form
    128,712.36/192,978.92 = 56,630.36/x
  3. Step 3: Cross multiply
    128,712.36x = 192,978.92 × 56,630.36
  4. Step 4: Simplify right side
    128,712.36x = 10,928,465,712.01
  5. Step 5: Solve for x
    x = 10,928,465,712.01/128,712.36
  6. Step 6: Final answer
    x = 84,906.11

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.