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Finding the Fourth Proportional to 928.21, 1,281.17 and 535.26

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Solution

The fourth proportional to 928.21, 1,281.17 and 535.26 is: 738.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.21 : 1,281.17 = 535.26 : x
  2. Step 2: Convert to fraction form
    928.21/1,281.17 = 535.26/x
  3. Step 3: Cross multiply
    928.21x = 1,281.17 × 535.26
  4. Step 4: Simplify right side
    928.21x = 685,759.05
  5. Step 5: Solve for x
    x = 685,759.05/928.21
  6. Step 6: Final answer
    x = 738.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.