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Finding the Fourth Proportional to 259,672.40, 389,518.32 and 72,679.04

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Solution

The fourth proportional to 259,672.40, 389,518.32 and 72,679.04 is: 109,021.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,672.40 : 389,518.32 = 72,679.04 : x
  2. Step 2: Convert to fraction form
    259,672.40/389,518.32 = 72,679.04/x
  3. Step 3: Cross multiply
    259,672.40x = 389,518.32 × 72,679.04
  4. Step 4: Simplify right side
    259,672.40x = 28,309,817,560.01
  5. Step 5: Solve for x
    x = 28,309,817,560.01/259,672.40
  6. Step 6: Final answer
    x = 109,021.28

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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.