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Finding the Fourth Proportional to 120,129.72, 165,783.72 and 79,773.92

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Solution

The fourth proportional to 120,129.72, 165,783.72 and 79,773.92 is: 110,091.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,129.72 : 165,783.72 = 79,773.92 : x
  2. Step 2: Convert to fraction form
    120,129.72/165,783.72 = 79,773.92/x
  3. Step 3: Cross multiply
    120,129.72x = 165,783.72 × 79,773.92
  4. Step 4: Simplify right side
    120,129.72x = 13,225,217,216.58
  5. Step 5: Solve for x
    x = 13,225,217,216.58/120,129.72
  6. Step 6: Final answer
    x = 110,091.13

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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.