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Finding the Fourth Proportional to 559.76, 840.12 and 218

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Solution

The fourth proportional to 559.76, 840.12 and 218 is: 327.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.76 : 840.12 = 218 : x
  2. Step 2: Convert to fraction form
    559.76/840.12 = 218/x
  3. Step 3: Cross multiply
    559.76x = 840.12 × 218
  4. Step 4: Simplify right side
    559.76x = 183,146.16
  5. Step 5: Solve for x
    x = 183,146.16/559.76
  6. Step 6: Final answer
    x = 327.19

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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.