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Finding the Fourth Proportional to 685,075.88, 945,311.13 and 394,579.40

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Solution

The fourth proportional to 685,075.88, 945,311.13 and 394,579.40 is: 544,465.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,075.88 : 945,311.13 = 394,579.40 : x
  2. Step 2: Convert to fraction form
    685,075.88/945,311.13 = 394,579.40/x
  3. Step 3: Cross multiply
    685,075.88x = 945,311.13 × 394,579.40
  4. Step 4: Simplify right side
    685,075.88x = 373,000,304,177.33
  5. Step 5: Solve for x
    x = 373,000,304,177.33/685,075.88
  6. Step 6: Final answer
    x = 544,465.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.