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Finding the Fourth Proportional to 61,356.97, 91,980.09 and 42,645.82

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Solution

The fourth proportional to 61,356.97, 91,980.09 and 42,645.82 is: 63,930.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,356.97 : 91,980.09 = 42,645.82 : x
  2. Step 2: Convert to fraction form
    61,356.97/91,980.09 = 42,645.82/x
  3. Step 3: Cross multiply
    61,356.97x = 91,980.09 × 42,645.82
  4. Step 4: Simplify right side
    61,356.97x = 3,922,566,361.72
  5. Step 5: Solve for x
    x = 3,922,566,361.72/61,356.97
  6. Step 6: Final answer
    x = 63,930.25

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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.