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Finding the Fourth Proportional to 289,978.20, 434,837.70 and 112,426.20

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Solution

The fourth proportional to 289,978.20, 434,837.70 and 112,426.20 is: 168,589.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,978.20 : 434,837.70 = 112,426.20 : x
  2. Step 2: Convert to fraction form
    289,978.20/434,837.70 = 112,426.20/x
  3. Step 3: Cross multiply
    289,978.20x = 434,837.70 × 112,426.20
  4. Step 4: Simplify right side
    289,978.20x = 48,887,150,227.74
  5. Step 5: Solve for x
    x = 48,887,150,227.74/289,978.20
  6. Step 6: Final answer
    x = 168,589.05

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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.