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Finding the Fourth Proportional to 806.56, 1,211.21 and 442.06

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Solution

The fourth proportional to 806.56, 1,211.21 and 442.06 is: 663.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.56 : 1,211.21 = 442.06 : x
  2. Step 2: Convert to fraction form
    806.56/1,211.21 = 442.06/x
  3. Step 3: Cross multiply
    806.56x = 1,211.21 × 442.06
  4. Step 4: Simplify right side
    806.56x = 535,427.49
  5. Step 5: Solve for x
    x = 535,427.49/806.56
  6. Step 6: Final answer
    x = 663.84

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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.