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Finding the Fourth Proportional to 320.74, 442.58 and 189.76

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Solution

The fourth proportional to 320.74, 442.58 and 189.76 is: 261.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.74 : 442.58 = 189.76 : x
  2. Step 2: Convert to fraction form
    320.74/442.58 = 189.76/x
  3. Step 3: Cross multiply
    320.74x = 442.58 × 189.76
  4. Step 4: Simplify right side
    320.74x = 83,983.98
  5. Step 5: Solve for x
    x = 83,983.98/320.74
  6. Step 6: Final answer
    x = 261.84

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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.