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Finding the Fourth Proportional to 830.51, 1,245.80 and 214.22

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Solution

The fourth proportional to 830.51, 1,245.80 and 214.22 is: 321.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.51 : 1,245.80 = 214.22 : x
  2. Step 2: Convert to fraction form
    830.51/1,245.80 = 214.22/x
  3. Step 3: Cross multiply
    830.51x = 1,245.80 × 214.22
  4. Step 4: Simplify right side
    830.51x = 266,867.98
  5. Step 5: Solve for x
    x = 266,867.98/830.51
  6. Step 6: Final answer
    x = 321.33

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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.