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Finding the Fourth Proportional to 872.95, 1,309.42 and 214.83

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Solution

The fourth proportional to 872.95, 1,309.42 and 214.83 is: 322.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.95 : 1,309.42 = 214.83 : x
  2. Step 2: Convert to fraction form
    872.95/1,309.42 = 214.83/x
  3. Step 3: Cross multiply
    872.95x = 1,309.42 × 214.83
  4. Step 4: Simplify right side
    872.95x = 281,302.70
  5. Step 5: Solve for x
    x = 281,302.70/872.95
  6. Step 6: Final answer
    x = 322.24

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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.