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Finding the Fourth Proportional to 816.60, 1,224.18 and 528.60

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Solution

The fourth proportional to 816.60, 1,224.18 and 528.60 is: 792.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.60 : 1,224.18 = 528.60 : x
  2. Step 2: Convert to fraction form
    816.60/1,224.18 = 528.60/x
  3. Step 3: Cross multiply
    816.60x = 1,224.18 × 528.60
  4. Step 4: Simplify right side
    816.60x = 647,101.55
  5. Step 5: Solve for x
    x = 647,101.55/816.60
  6. Step 6: Final answer
    x = 792.43

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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.