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Finding the Fourth Proportional to 921.08, 1,379.50 and 839.07

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Solution

The fourth proportional to 921.08, 1,379.50 and 839.07 is: 1,256.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.08 : 1,379.50 = 839.07 : x
  2. Step 2: Convert to fraction form
    921.08/1,379.50 = 839.07/x
  3. Step 3: Cross multiply
    921.08x = 1,379.50 × 839.07
  4. Step 4: Simplify right side
    921.08x = 1,157,494.97
  5. Step 5: Solve for x
    x = 1,157,494.97/921.08
  6. Step 6: Final answer
    x = 1,256.67

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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.