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Finding the Fourth Proportional to 222.58, 307.18 and 139.70

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Solution

The fourth proportional to 222.58, 307.18 and 139.70 is: 192.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.58 : 307.18 = 139.70 : x
  2. Step 2: Convert to fraction form
    222.58/307.18 = 139.70/x
  3. Step 3: Cross multiply
    222.58x = 307.18 × 139.70
  4. Step 4: Simplify right side
    222.58x = 42,913.05
  5. Step 5: Solve for x
    x = 42,913.05/222.58
  6. Step 6: Final answer
    x = 192.80

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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.