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Finding the Fourth Proportional to 928.80, 1,280.20 and 816.48

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Solution

The fourth proportional to 928.80, 1,280.20 and 816.48 is: 1,125.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.80 : 1,280.20 = 816.48 : x
  2. Step 2: Convert to fraction form
    928.80/1,280.20 = 816.48/x
  3. Step 3: Cross multiply
    928.80x = 1,280.20 × 816.48
  4. Step 4: Simplify right side
    928.80x = 1,045,257.70
  5. Step 5: Solve for x
    x = 1,045,257.70/928.80
  6. Step 6: Final answer
    x = 1,125.39

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1.5x scale

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.