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Finding the Fourth Proportional to 223.06, 309.40 and 215.68

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Solution

The fourth proportional to 223.06, 309.40 and 215.68 is: 299.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.06 : 309.40 = 215.68 : x
  2. Step 2: Convert to fraction form
    223.06/309.40 = 215.68/x
  3. Step 3: Cross multiply
    223.06x = 309.40 × 215.68
  4. Step 4: Simplify right side
    223.06x = 66,728.77
  5. Step 5: Solve for x
    x = 66,728.77/223.06
  6. Step 6: Final answer
    x = 299.16

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.