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Finding the Fourth Proportional to 612.20, 917.80 and 222

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Solution

The fourth proportional to 612.20, 917.80 and 222 is: 332.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.20 : 917.80 = 222 : x
  2. Step 2: Convert to fraction form
    612.20/917.80 = 222/x
  3. Step 3: Cross multiply
    612.20x = 917.80 × 222
  4. Step 4: Simplify right side
    612.20x = 203,751.60
  5. Step 5: Solve for x
    x = 203,751.60/612.20
  6. Step 6: Final answer
    x = 332.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.