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Finding the Fourth Proportional to 120,111.78, 165,751.80 and 66,399.06

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Solution

The fourth proportional to 120,111.78, 165,751.80 and 66,399.06 is: 91,629.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,111.78 : 165,751.80 = 66,399.06 : x
  2. Step 2: Convert to fraction form
    120,111.78/165,751.80 = 66,399.06/x
  3. Step 3: Cross multiply
    120,111.78x = 165,751.80 × 66,399.06
  4. Step 4: Simplify right side
    120,111.78x = 11,005,763,713.31
  5. Step 5: Solve for x
    x = 11,005,763,713.31/120,111.78
  6. Step 6: Final answer
    x = 91,629.34

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1.5x scale

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.