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Finding the Fourth Proportional to 693.76, 1,040.08 and 400.56

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Solution

The fourth proportional to 693.76, 1,040.08 and 400.56 is: 600.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.76 : 1,040.08 = 400.56 : x
  2. Step 2: Convert to fraction form
    693.76/1,040.08 = 400.56/x
  3. Step 3: Cross multiply
    693.76x = 1,040.08 × 400.56
  4. Step 4: Simplify right side
    693.76x = 416,614.44
  5. Step 5: Solve for x
    x = 416,614.44/693.76
  6. Step 6: Final answer
    x = 600.52

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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.