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Finding the Fourth Proportional to 310.58, 428.49 and 190.90

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Solution

The fourth proportional to 310.58, 428.49 and 190.90 is: 263.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.58 : 428.49 = 190.90 : x
  2. Step 2: Convert to fraction form
    310.58/428.49 = 190.90/x
  3. Step 3: Cross multiply
    310.58x = 428.49 × 190.90
  4. Step 4: Simplify right side
    310.58x = 81,798.26
  5. Step 5: Solve for x
    x = 81,798.26/310.58
  6. Step 6: Final answer
    x = 263.37

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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.