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Finding the Fourth Proportional to 827.60, 1,245.60 and 623.20

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Solution

The fourth proportional to 827.60, 1,245.60 and 623.20 is: 937.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.60 : 1,245.60 = 623.20 : x
  2. Step 2: Convert to fraction form
    827.60/1,245.60 = 623.20/x
  3. Step 3: Cross multiply
    827.60x = 1,245.60 × 623.20
  4. Step 4: Simplify right side
    827.60x = 776,257.92
  5. Step 5: Solve for x
    x = 776,257.92/827.60
  6. Step 6: Final answer
    x = 937.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.