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Finding the Fourth Proportional to 853.94, 1,280.12 and 777.86

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Solution

The fourth proportional to 853.94, 1,280.12 and 777.86 is: 1,166.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.94 : 1,280.12 = 777.86 : x
  2. Step 2: Convert to fraction form
    853.94/1,280.12 = 777.86/x
  3. Step 3: Cross multiply
    853.94x = 1,280.12 × 777.86
  4. Step 4: Simplify right side
    853.94x = 995,753.45
  5. Step 5: Solve for x
    x = 995,753.45/853.94
  6. Step 6: Final answer
    x = 1,166.07

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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.