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Finding the Fourth Proportional to 123,639.20, 185,415.60 and 64,455.20

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Solution

The fourth proportional to 123,639.20, 185,415.60 and 64,455.20 is: 96,660.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,639.20 : 185,415.60 = 64,455.20 : x
  2. Step 2: Convert to fraction form
    123,639.20/185,415.60 = 64,455.20/x
  3. Step 3: Cross multiply
    123,639.20x = 185,415.60 × 64,455.20
  4. Step 4: Simplify right side
    123,639.20x = 11,950,999,581.12
  5. Step 5: Solve for x
    x = 11,950,999,581.12/123,639.20
  6. Step 6: Final answer
    x = 96,660.28

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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.