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Finding the Fourth Proportional to 693.36, 1,040.36 and 308.72

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Solution

The fourth proportional to 693.36, 1,040.36 and 308.72 is: 463.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.36 : 1,040.36 = 308.72 : x
  2. Step 2: Convert to fraction form
    693.36/1,040.36 = 308.72/x
  3. Step 3: Cross multiply
    693.36x = 1,040.36 × 308.72
  4. Step 4: Simplify right side
    693.36x = 321,179.94
  5. Step 5: Solve for x
    x = 321,179.94/693.36
  6. Step 6: Final answer
    x = 463.22

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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.