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Finding the Fourth Proportional to 42,490.54, 63,735.79 and 12,908.26

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Solution

The fourth proportional to 42,490.54, 63,735.79 and 12,908.26 is: 19,362.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,490.54 : 63,735.79 = 12,908.26 : x
  2. Step 2: Convert to fraction form
    42,490.54/63,735.79 = 12,908.26/x
  3. Step 3: Cross multiply
    42,490.54x = 63,735.79 × 12,908.26
  4. Step 4: Simplify right side
    42,490.54x = 822,718,148.63
  5. Step 5: Solve for x
    x = 822,718,148.63/42,490.54
  6. Step 6: Final answer
    x = 19,362.38

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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.