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Finding the Fourth Proportional to 816.22, 1,223.70 and 508

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Solution

The fourth proportional to 816.22, 1,223.70 and 508 is: 761.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.22 : 1,223.70 = 508 : x
  2. Step 2: Convert to fraction form
    816.22/1,223.70 = 508/x
  3. Step 3: Cross multiply
    816.22x = 1,223.70 × 508
  4. Step 4: Simplify right side
    816.22x = 621,639.60
  5. Step 5: Solve for x
    x = 621,639.60/816.22
  6. Step 6: Final answer
    x = 761.61

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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.