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Finding the Fourth Proportional to 845.56, 1,267.34 and 639.44

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Solution

The fourth proportional to 845.56, 1,267.34 and 639.44 is: 958.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.56 : 1,267.34 = 639.44 : x
  2. Step 2: Convert to fraction form
    845.56/1,267.34 = 639.44/x
  3. Step 3: Cross multiply
    845.56x = 1,267.34 × 639.44
  4. Step 4: Simplify right side
    845.56x = 810,387.89
  5. Step 5: Solve for x
    x = 810,387.89/845.56
  6. Step 6: Final answer
    x = 958.40

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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.