Home / 420,812.20-629,663.10-383,487.40

Finding the Fourth Proportional to 420,812.20, 629,663.10 and 383,487.40

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Solution

The fourth proportional to 420,812.20, 629,663.10 and 383,487.40 is: 573,813.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,812.20 : 629,663.10 = 383,487.40 : x
  2. Step 2: Convert to fraction form
    420,812.20/629,663.10 = 383,487.40/x
  3. Step 3: Cross multiply
    420,812.20x = 629,663.10 × 383,487.40
  4. Step 4: Simplify right side
    420,812.20x = 241,467,865,094.94
  5. Step 5: Solve for x
    x = 241,467,865,094.94/420,812.20
  6. Step 6: Final answer
    x = 573,813.84

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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.