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Finding the Fourth Proportional to 209,561.76, 289,190.16 and 120,132

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Solution

The fourth proportional to 209,561.76, 289,190.16 and 120,132 is: 165,779.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,561.76 : 289,190.16 = 120,132 : x
  2. Step 2: Convert to fraction form
    209,561.76/289,190.16 = 120,132/x
  3. Step 3: Cross multiply
    209,561.76x = 289,190.16 × 120,132
  4. Step 4: Simplify right side
    209,561.76x = 34,740,992,301.12
  5. Step 5: Solve for x
    x = 34,740,992,301.12/209,561.76
  6. Step 6: Final answer
    x = 165,779.25

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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.