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Finding the Fourth Proportional to 222.57, 307.06 and 139.67

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Solution

The fourth proportional to 222.57, 307.06 and 139.67 is: 192.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.57 : 307.06 = 139.67 : x
  2. Step 2: Convert to fraction form
    222.57/307.06 = 139.67/x
  3. Step 3: Cross multiply
    222.57x = 307.06 × 139.67
  4. Step 4: Simplify right side
    222.57x = 42,886.34
  5. Step 5: Solve for x
    x = 42,886.34/222.57
  6. Step 6: Final answer
    x = 192.69

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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.