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Finding the Fourth Proportional to 679,991.80, 1,019,112.90 and 413,469.40

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Solution

The fourth proportional to 679,991.80, 1,019,112.90 and 413,469.40 is: 619,672.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,991.80 : 1,019,112.90 = 413,469.40 : x
  2. Step 2: Convert to fraction form
    679,991.80/1,019,112.90 = 413,469.40/x
  3. Step 3: Cross multiply
    679,991.80x = 1,019,112.90 × 413,469.40
  4. Step 4: Simplify right side
    679,991.80x = 421,371,999,295.26
  5. Step 5: Solve for x
    x = 421,371,999,295.26/679,991.80
  6. Step 6: Final answer
    x = 619,672.18

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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.