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Finding the Fourth Proportional to 222.77, 307.40 and 139.86

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Solution

The fourth proportional to 222.77, 307.40 and 139.86 is: 192.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.77 : 307.40 = 139.86 : x
  2. Step 2: Convert to fraction form
    222.77/307.40 = 139.86/x
  3. Step 3: Cross multiply
    222.77x = 307.40 × 139.86
  4. Step 4: Simplify right side
    222.77x = 42,992.26
  5. Step 5: Solve for x
    x = 42,992.26/222.77
  6. Step 6: Final answer
    x = 192.99

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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.