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Finding the Fourth Proportional to 816.68, 1,225.16 and 405.83

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Solution

The fourth proportional to 816.68, 1,225.16 and 405.83 is: 608.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.68 : 1,225.16 = 405.83 : x
  2. Step 2: Convert to fraction form
    816.68/1,225.16 = 405.83/x
  3. Step 3: Cross multiply
    816.68x = 1,225.16 × 405.83
  4. Step 4: Simplify right side
    816.68x = 497,204.65
  5. Step 5: Solve for x
    x = 497,204.65/816.68
  6. Step 6: Final answer
    x = 608.81

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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.