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Finding the Fourth Proportional to 928.86, 1,281.11 and 680.09

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Solution

The fourth proportional to 928.86, 1,281.11 and 680.09 is: 938.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.86 : 1,281.11 = 680.09 : x
  2. Step 2: Convert to fraction form
    928.86/1,281.11 = 680.09/x
  3. Step 3: Cross multiply
    928.86x = 1,281.11 × 680.09
  4. Step 4: Simplify right side
    928.86x = 871,268.60
  5. Step 5: Solve for x
    x = 871,268.60/928.86
  6. Step 6: Final answer
    x = 938.00

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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.