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Finding the Fourth Proportional to 928.05, 1,280.75 and 613.59

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Solution

The fourth proportional to 928.05, 1,280.75 and 613.59 is: 846.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.05 : 1,280.75 = 613.59 : x
  2. Step 2: Convert to fraction form
    928.05/1,280.75 = 613.59/x
  3. Step 3: Cross multiply
    928.05x = 1,280.75 × 613.59
  4. Step 4: Simplify right side
    928.05x = 785,855.39
  5. Step 5: Solve for x
    x = 785,855.39/928.05
  6. Step 6: Final answer
    x = 846.78

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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.