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Finding the Fourth Proportional to 693.94, 1,040.70 and 385.94

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Solution

The fourth proportional to 693.94, 1,040.70 and 385.94 is: 578.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.94 : 1,040.70 = 385.94 : x
  2. Step 2: Convert to fraction form
    693.94/1,040.70 = 385.94/x
  3. Step 3: Cross multiply
    693.94x = 1,040.70 × 385.94
  4. Step 4: Simplify right side
    693.94x = 401,647.76
  5. Step 5: Solve for x
    x = 401,647.76/693.94
  6. Step 6: Final answer
    x = 578.79

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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.