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Finding the Fourth Proportional to 389,905.40, 583,691.70 and 343,249.40

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Solution

The fourth proportional to 389,905.40, 583,691.70 and 343,249.40 is: 513,847.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,905.40 : 583,691.70 = 343,249.40 : x
  2. Step 2: Convert to fraction form
    389,905.40/583,691.70 = 343,249.40/x
  3. Step 3: Cross multiply
    389,905.40x = 583,691.70 × 343,249.40
  4. Step 4: Simplify right side
    389,905.40x = 200,351,825,809.98
  5. Step 5: Solve for x
    x = 200,351,825,809.98/389,905.40
  6. Step 6: Final answer
    x = 513,847.27

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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.