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Finding the Fourth Proportional to 611.78, 917.80 and 227.06

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Solution

The fourth proportional to 611.78, 917.80 and 227.06 is: 340.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.78 : 917.80 = 227.06 : x
  2. Step 2: Convert to fraction form
    611.78/917.80 = 227.06/x
  3. Step 3: Cross multiply
    611.78x = 917.80 × 227.06
  4. Step 4: Simplify right side
    611.78x = 208,395.67
  5. Step 5: Solve for x
    x = 208,395.67/611.78
  6. Step 6: Final answer
    x = 340.64

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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.