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Finding the Fourth Proportional to 838.97, 1,258.68 and 318.99

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Solution

The fourth proportional to 838.97, 1,258.68 and 318.99 is: 478.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.97 : 1,258.68 = 318.99 : x
  2. Step 2: Convert to fraction form
    838.97/1,258.68 = 318.99/x
  3. Step 3: Cross multiply
    838.97x = 1,258.68 × 318.99
  4. Step 4: Simplify right side
    838.97x = 401,506.33
  5. Step 5: Solve for x
    x = 401,506.33/838.97
  6. Step 6: Final answer
    x = 478.57

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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.