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Finding the Fourth Proportional to 320.99, 442.78 and 222.57

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Solution

The fourth proportional to 320.99, 442.78 and 222.57 is: 307.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.99 : 442.78 = 222.57 : x
  2. Step 2: Convert to fraction form
    320.99/442.78 = 222.57/x
  3. Step 3: Cross multiply
    320.99x = 442.78 × 222.57
  4. Step 4: Simplify right side
    320.99x = 98,548.99
  5. Step 5: Solve for x
    x = 98,548.99/320.99
  6. Step 6: Final answer
    x = 307.02

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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.