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Finding the Fourth Proportional to 66,726.80, 92,039.40 and 42,815.60

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Solution

The fourth proportional to 66,726.80, 92,039.40 and 42,815.60 is: 59,057.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,726.80 : 92,039.40 = 42,815.60 : x
  2. Step 2: Convert to fraction form
    66,726.80/92,039.40 = 42,815.60/x
  3. Step 3: Cross multiply
    66,726.80x = 92,039.40 × 42,815.60
  4. Step 4: Simplify right side
    66,726.80x = 3,940,722,134.64
  5. Step 5: Solve for x
    x = 3,940,722,134.64/66,726.80
  6. Step 6: Final answer
    x = 59,057.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.