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Finding the Fourth Proportional to 693.40, 1,040.27 and 385.60

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Solution

The fourth proportional to 693.40, 1,040.27 and 385.60 is: 578.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.40 : 1,040.27 = 385.60 : x
  2. Step 2: Convert to fraction form
    693.40/1,040.27 = 385.60/x
  3. Step 3: Cross multiply
    693.40x = 1,040.27 × 385.60
  4. Step 4: Simplify right side
    693.40x = 401,128.11
  5. Step 5: Solve for x
    x = 401,128.11/693.40
  6. Step 6: Final answer
    x = 578.49

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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.