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Finding the Fourth Proportional to 320.84, 442.78 and 189.86

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Solution

The fourth proportional to 320.84, 442.78 and 189.86 is: 262.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.84 : 442.78 = 189.86 : x
  2. Step 2: Convert to fraction form
    320.84/442.78 = 189.86/x
  3. Step 3: Cross multiply
    320.84x = 442.78 × 189.86
  4. Step 4: Simplify right side
    320.84x = 84,066.21
  5. Step 5: Solve for x
    x = 84,066.21/320.84
  6. Step 6: Final answer
    x = 262.02

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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.