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Finding the Fourth Proportional to 120,779.99, 180,972.70 and 73,409.57

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Solution

The fourth proportional to 120,779.99, 180,972.70 and 73,409.57 is: 109,994.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,779.99 : 180,972.70 = 73,409.57 : x
  2. Step 2: Convert to fraction form
    120,779.99/180,972.70 = 73,409.57/x
  3. Step 3: Cross multiply
    120,779.99x = 180,972.70 × 73,409.57
  4. Step 4: Simplify right side
    120,779.99x = 13,285,129,109.90
  5. Step 5: Solve for x
    x = 13,285,129,109.90/120,779.99
  6. Step 6: Final answer
    x = 109,994.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.