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Finding the Fourth Proportional to 320.76, 442.35 and 281.88

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Solution

The fourth proportional to 320.76, 442.35 and 281.88 is: 388.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.76 : 442.35 = 281.88 : x
  2. Step 2: Convert to fraction form
    320.76/442.35 = 281.88/x
  3. Step 3: Cross multiply
    320.76x = 442.35 × 281.88
  4. Step 4: Simplify right side
    320.76x = 124,689.62
  5. Step 5: Solve for x
    x = 124,689.62/320.76
  6. Step 6: Final answer
    x = 388.73

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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.