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Finding the Fourth Proportional to 309.72, 424.62 and 304.26

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Solution

The fourth proportional to 309.72, 424.62 and 304.26 is: 417.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.72 : 424.62 = 304.26 : x
  2. Step 2: Convert to fraction form
    309.72/424.62 = 304.26/x
  3. Step 3: Cross multiply
    309.72x = 424.62 × 304.26
  4. Step 4: Simplify right side
    309.72x = 129,194.88
  5. Step 5: Solve for x
    x = 129,194.88/309.72
  6. Step 6: Final answer
    x = 417.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.