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Finding the Fourth Proportional to 351.90, 485.28 and 312.57

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Solution

The fourth proportional to 351.90, 485.28 and 312.57 is: 431.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.90 : 485.28 = 312.57 : x
  2. Step 2: Convert to fraction form
    351.90/485.28 = 312.57/x
  3. Step 3: Cross multiply
    351.90x = 485.28 × 312.57
  4. Step 4: Simplify right side
    351.90x = 151,683.97
  5. Step 5: Solve for x
    x = 151,683.97/351.90
  6. Step 6: Final answer
    x = 431.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.