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Finding the Fourth Proportional to 817.06, 1,225.72 and 406.21

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Solution

The fourth proportional to 817.06, 1,225.72 and 406.21 is: 609.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.06 : 1,225.72 = 406.21 : x
  2. Step 2: Convert to fraction form
    817.06/1,225.72 = 406.21/x
  3. Step 3: Cross multiply
    817.06x = 1,225.72 × 406.21
  4. Step 4: Simplify right side
    817.06x = 497,899.72
  5. Step 5: Solve for x
    x = 497,899.72/817.06
  6. Step 6: Final answer
    x = 609.38

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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.