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Finding the Fourth Proportional to 928.40, 1,281.38 and 535.37

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Solution

The fourth proportional to 928.40, 1,281.38 and 535.37 is: 738.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.40 : 1,281.38 = 535.37 : x
  2. Step 2: Convert to fraction form
    928.40/1,281.38 = 535.37/x
  3. Step 3: Cross multiply
    928.40x = 1,281.38 × 535.37
  4. Step 4: Simplify right side
    928.40x = 686,003.33
  5. Step 5: Solve for x
    x = 686,003.33/928.40
  6. Step 6: Final answer
    x = 738.91

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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.