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Finding the Fourth Proportional to 930.69, 1,396.31 and 314.34

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Solution

The fourth proportional to 930.69, 1,396.31 and 314.34 is: 471.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.69 : 1,396.31 = 314.34 : x
  2. Step 2: Convert to fraction form
    930.69/1,396.31 = 314.34/x
  3. Step 3: Cross multiply
    930.69x = 1,396.31 × 314.34
  4. Step 4: Simplify right side
    930.69x = 438,915.86
  5. Step 5: Solve for x
    x = 438,915.86/930.69
  6. Step 6: Final answer
    x = 471.60

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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.