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Finding the Fourth Proportional to 320.50, 442.10 and 189.50

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Solution

The fourth proportional to 320.50, 442.10 and 189.50 is: 261.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.50 : 442.10 = 189.50 : x
  2. Step 2: Convert to fraction form
    320.50/442.10 = 189.50/x
  3. Step 3: Cross multiply
    320.50x = 442.10 × 189.50
  4. Step 4: Simplify right side
    320.50x = 83,777.95
  5. Step 5: Solve for x
    x = 83,777.95/320.50
  6. Step 6: Final answer
    x = 261.40

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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.