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Finding the Fourth Proportional to 120,356.66, 166,078.78 and 66,628.22

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Solution

The fourth proportional to 120,356.66, 166,078.78 and 66,628.22 is: 91,939.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,356.66 : 166,078.78 = 66,628.22 : x
  2. Step 2: Convert to fraction form
    120,356.66/166,078.78 = 66,628.22/x
  3. Step 3: Cross multiply
    120,356.66x = 166,078.78 × 66,628.22
  4. Step 4: Simplify right side
    120,356.66x = 11,065,533,491.17
  5. Step 5: Solve for x
    x = 11,065,533,491.17/120,356.66
  6. Step 6: Final answer
    x = 91,939.52

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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.