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Finding the Fourth Proportional to 120,103.72, 165,743.08 and 66,388.76

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Solution

The fourth proportional to 120,103.72, 165,743.08 and 66,388.76 is: 91,616.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,103.72 : 165,743.08 = 66,388.76 : x
  2. Step 2: Convert to fraction form
    120,103.72/165,743.08 = 66,388.76/x
  3. Step 3: Cross multiply
    120,103.72x = 165,743.08 × 66,388.76
  4. Step 4: Simplify right side
    120,103.72x = 11,003,477,559.78
  5. Step 5: Solve for x
    x = 11,003,477,559.78/120,103.72
  6. Step 6: Final answer
    x = 91,616.46

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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.