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Finding the Fourth Proportional to 854.75, 1,280.55 and 762.51

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Solution

The fourth proportional to 854.75, 1,280.55 and 762.51 is: 1,142.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.75 : 1,280.55 = 762.51 : x
  2. Step 2: Convert to fraction form
    854.75/1,280.55 = 762.51/x
  3. Step 3: Cross multiply
    854.75x = 1,280.55 × 762.51
  4. Step 4: Simplify right side
    854.75x = 976,432.18
  5. Step 5: Solve for x
    x = 976,432.18/854.75
  6. Step 6: Final answer
    x = 1,142.37

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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.