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Finding the Fourth Proportional to 643,814.70, 965,722.05 and 404,313.90

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Solution

The fourth proportional to 643,814.70, 965,722.05 and 404,313.90 is: 606,470.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,814.70 : 965,722.05 = 404,313.90 : x
  2. Step 2: Convert to fraction form
    643,814.70/965,722.05 = 404,313.90/x
  3. Step 3: Cross multiply
    643,814.70x = 965,722.05 × 404,313.90
  4. Step 4: Simplify right side
    643,814.70x = 390,454,848,351.50
  5. Step 5: Solve for x
    x = 390,454,848,351.50/643,814.70
  6. Step 6: Final answer
    x = 606,470.85

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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.