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Finding the Fourth Proportional to 816.81, 1,225.45 and 405.84

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Solution

The fourth proportional to 816.81, 1,225.45 and 405.84 is: 608.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.81 : 1,225.45 = 405.84 : x
  2. Step 2: Convert to fraction form
    816.81/1,225.45 = 405.84/x
  3. Step 3: Cross multiply
    816.81x = 1,225.45 × 405.84
  4. Step 4: Simplify right side
    816.81x = 497,336.63
  5. Step 5: Solve for x
    x = 497,336.63/816.81
  6. Step 6: Final answer
    x = 608.88

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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.