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Finding the Fourth Proportional to 930.99, 1,396.61 and 314.57

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Solution

The fourth proportional to 930.99, 1,396.61 and 314.57 is: 471.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.99 : 1,396.61 = 314.57 : x
  2. Step 2: Convert to fraction form
    930.99/1,396.61 = 314.57/x
  3. Step 3: Cross multiply
    930.99x = 1,396.61 × 314.57
  4. Step 4: Simplify right side
    930.99x = 439,331.61
  5. Step 5: Solve for x
    x = 439,331.61/930.99
  6. Step 6: Final answer
    x = 471.90

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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.