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Finding the Fourth Proportional to 259,405.52, 389,120.20 and 79,478.06

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Solution

The fourth proportional to 259,405.52, 389,120.20 and 79,478.06 is: 119,220.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,405.52 : 389,120.20 = 79,478.06 : x
  2. Step 2: Convert to fraction form
    259,405.52/389,120.20 = 79,478.06/x
  3. Step 3: Cross multiply
    259,405.52x = 389,120.20 × 79,478.06
  4. Step 4: Simplify right side
    259,405.52x = 30,926,516,458.52
  5. Step 5: Solve for x
    x = 30,926,516,458.52/259,405.52
  6. Step 6: Final answer
    x = 119,220.74

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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.