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Finding the Fourth Proportional to 303.98, 453.31 and 287.31

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Solution

The fourth proportional to 303.98, 453.31 and 287.31 is: 428.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.98 : 453.31 = 287.31 : x
  2. Step 2: Convert to fraction form
    303.98/453.31 = 287.31/x
  3. Step 3: Cross multiply
    303.98x = 453.31 × 287.31
  4. Step 4: Simplify right side
    303.98x = 130,239.06
  5. Step 5: Solve for x
    x = 130,239.06/303.98
  6. Step 6: Final answer
    x = 428.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.