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Finding the Fourth Proportional to 853.51, 1,280.26 and 276.39

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Solution

The fourth proportional to 853.51, 1,280.26 and 276.39 is: 414.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.51 : 1,280.26 = 276.39 : x
  2. Step 2: Convert to fraction form
    853.51/1,280.26 = 276.39/x
  3. Step 3: Cross multiply
    853.51x = 1,280.26 × 276.39
  4. Step 4: Simplify right side
    853.51x = 353,846.25
  5. Step 5: Solve for x
    x = 353,846.25/853.51
  6. Step 6: Final answer
    x = 414.58

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Double scale
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Similar ratio
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1.5x scale

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.