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Finding the Fourth Proportional to 854.81, 1,282.67 and 839.55

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Solution

The fourth proportional to 854.81, 1,282.67 and 839.55 is: 1,259.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.81 : 1,282.67 = 839.55 : x
  2. Step 2: Convert to fraction form
    854.81/1,282.67 = 839.55/x
  3. Step 3: Cross multiply
    854.81x = 1,282.67 × 839.55
  4. Step 4: Simplify right side
    854.81x = 1,076,865.60
  5. Step 5: Solve for x
    x = 1,076,865.60/854.81
  6. Step 6: Final answer
    x = 1,259.77

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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.