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Finding the Fourth Proportional to 355.68, 490.68 and 311.88

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Solution

The fourth proportional to 355.68, 490.68 and 311.88 is: 430.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.68 : 490.68 = 311.88 : x
  2. Step 2: Convert to fraction form
    355.68/490.68 = 311.88/x
  3. Step 3: Cross multiply
    355.68x = 490.68 × 311.88
  4. Step 4: Simplify right side
    355.68x = 153,033.28
  5. Step 5: Solve for x
    x = 153,033.28/355.68
  6. Step 6: Final answer
    x = 430.26

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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.