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Finding the Fourth Proportional to 222.45, 307.05 and 139.53

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Solution

The fourth proportional to 222.45, 307.05 and 139.53 is: 192.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.45 : 307.05 = 139.53 : x
  2. Step 2: Convert to fraction form
    222.45/307.05 = 139.53/x
  3. Step 3: Cross multiply
    222.45x = 307.05 × 139.53
  4. Step 4: Simplify right side
    222.45x = 42,842.69
  5. Step 5: Solve for x
    x = 42,842.69/222.45
  6. Step 6: Final answer
    x = 192.59

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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.