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Finding the Fourth Proportional to 806.19, 1,209.21 and 415.98

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Solution

The fourth proportional to 806.19, 1,209.21 and 415.98 is: 623.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.19 : 1,209.21 = 415.98 : x
  2. Step 2: Convert to fraction form
    806.19/1,209.21 = 415.98/x
  3. Step 3: Cross multiply
    806.19x = 1,209.21 × 415.98
  4. Step 4: Simplify right side
    806.19x = 503,005.62
  5. Step 5: Solve for x
    x = 503,005.62/806.19
  6. Step 6: Final answer
    x = 623.93

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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.