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Finding the Fourth Proportional to 320.27, 442.40 and 287.46

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Solution

The fourth proportional to 320.27, 442.40 and 287.46 is: 397.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.27 : 442.40 = 287.46 : x
  2. Step 2: Convert to fraction form
    320.27/442.40 = 287.46/x
  3. Step 3: Cross multiply
    320.27x = 442.40 × 287.46
  4. Step 4: Simplify right side
    320.27x = 127,170.87
  5. Step 5: Solve for x
    x = 127,170.87/320.27
  6. Step 6: Final answer
    x = 397.08

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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.