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Finding the Fourth Proportional to 691,305.21, 954,005.13 and 385,401

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Solution

The fourth proportional to 691,305.21, 954,005.13 and 385,401 is: 531,855.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,305.21 : 954,005.13 = 385,401 : x
  2. Step 2: Convert to fraction form
    691,305.21/954,005.13 = 385,401/x
  3. Step 3: Cross multiply
    691,305.21x = 954,005.13 × 385,401
  4. Step 4: Simplify right side
    691,305.21x = 367,674,531,107.13
  5. Step 5: Solve for x
    x = 367,674,531,107.13/691,305.21
  6. Step 6: Final answer
    x = 531,855.58

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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.