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Finding the Fourth Proportional to 42,608.25, 63,921.75 and 12,620.16

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Solution

The fourth proportional to 42,608.25, 63,921.75 and 12,620.16 is: 18,933.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,608.25 : 63,921.75 = 12,620.16 : x
  2. Step 2: Convert to fraction form
    42,608.25/63,921.75 = 12,620.16/x
  3. Step 3: Cross multiply
    42,608.25x = 63,921.75 × 12,620.16
  4. Step 4: Simplify right side
    42,608.25x = 806,702,712.48
  5. Step 5: Solve for x
    x = 806,702,712.48/42,608.25
  6. Step 6: Final answer
    x = 18,933.02

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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.