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Finding the Fourth Proportional to 68,400.61, 102,616.72 and 21,653.48

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Solution

The fourth proportional to 68,400.61, 102,616.72 and 21,653.48 is: 32,485.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,400.61 : 102,616.72 = 21,653.48 : x
  2. Step 2: Convert to fraction form
    68,400.61/102,616.72 = 21,653.48/x
  3. Step 3: Cross multiply
    68,400.61x = 102,616.72 × 21,653.48
  4. Step 4: Simplify right side
    68,400.61x = 2,222,009,296.59
  5. Step 5: Solve for x
    x = 2,222,009,296.59/68,400.61
  6. Step 6: Final answer
    x = 32,485.23

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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.