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Finding the Fourth Proportional to 120,431.80, 180,574.80 and 53,859.52

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Solution

The fourth proportional to 120,431.80, 180,574.80 and 53,859.52 is: 80,756.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,431.80 : 180,574.80 = 53,859.52 : x
  2. Step 2: Convert to fraction form
    120,431.80/180,574.80 = 53,859.52/x
  3. Step 3: Cross multiply
    120,431.80x = 180,574.80 × 53,859.52
  4. Step 4: Simplify right side
    120,431.80x = 9,725,672,052.10
  5. Step 5: Solve for x
    x = 9,725,672,052.10/120,431.80
  6. Step 6: Final answer
    x = 80,756.68

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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.