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Finding the Fourth Proportional to 320.49, 442.28 and 309.46

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Solution

The fourth proportional to 320.49, 442.28 and 309.46 is: 427.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.49 : 442.28 = 309.46 : x
  2. Step 2: Convert to fraction form
    320.49/442.28 = 309.46/x
  3. Step 3: Cross multiply
    320.49x = 442.28 × 309.46
  4. Step 4: Simplify right side
    320.49x = 136,867.97
  5. Step 5: Solve for x
    x = 136,867.97/320.49
  6. Step 6: Final answer
    x = 427.06

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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.