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Finding the Fourth Proportional to 312.26, 468.48 and 257.90

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Solution

The fourth proportional to 312.26, 468.48 and 257.90 is: 386.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.26 : 468.48 = 257.90 : x
  2. Step 2: Convert to fraction form
    312.26/468.48 = 257.90/x
  3. Step 3: Cross multiply
    312.26x = 468.48 × 257.90
  4. Step 4: Simplify right side
    312.26x = 120,820.99
  5. Step 5: Solve for x
    x = 120,820.99/312.26
  6. Step 6: Final answer
    x = 386.92

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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.