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Finding the Fourth Proportional to 806.88, 1,211.38 and 478.42

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Solution

The fourth proportional to 806.88, 1,211.38 and 478.42 is: 718.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.88 : 1,211.38 = 478.42 : x
  2. Step 2: Convert to fraction form
    806.88/1,211.38 = 478.42/x
  3. Step 3: Cross multiply
    806.88x = 1,211.38 × 478.42
  4. Step 4: Simplify right side
    806.88x = 579,548.42
  5. Step 5: Solve for x
    x = 579,548.42/806.88
  6. Step 6: Final answer
    x = 718.26

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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.