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Finding the Fourth Proportional to 806.16, 1,208.63 and 415.74

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Solution

The fourth proportional to 806.16, 1,208.63 and 415.74 is: 623.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.16 : 1,208.63 = 415.74 : x
  2. Step 2: Convert to fraction form
    806.16/1,208.63 = 415.74/x
  3. Step 3: Cross multiply
    806.16x = 1,208.63 × 415.74
  4. Step 4: Simplify right side
    806.16x = 502,467.71
  5. Step 5: Solve for x
    x = 502,467.71/806.16
  6. Step 6: Final answer
    x = 623.29

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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.