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Finding the Fourth Proportional to 289,589.20, 434,038.20 and 121,109.20

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Solution

The fourth proportional to 289,589.20, 434,038.20 and 121,109.20 is: 181,519.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,589.20 : 434,038.20 = 121,109.20 : x
  2. Step 2: Convert to fraction form
    289,589.20/434,038.20 = 121,109.20/x
  3. Step 3: Cross multiply
    289,589.20x = 434,038.20 × 121,109.20
  4. Step 4: Simplify right side
    289,589.20x = 52,566,019,171.44
  5. Step 5: Solve for x
    x = 52,566,019,171.44/289,589.20
  6. Step 6: Final answer
    x = 181,519.27

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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.