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Finding the Fourth Proportional to 1,318, 1,976.61 and 623.98

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Solution

The fourth proportional to 1,318, 1,976.61 and 623.98 is: 935.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318 : 1,976.61 = 623.98 : x
  2. Step 2: Convert to fraction form
    1,318/1,976.61 = 623.98/x
  3. Step 3: Cross multiply
    1,318x = 1,976.61 × 623.98
  4. Step 4: Simplify right side
    1,318x = 1,233,365.11
  5. Step 5: Solve for x
    x = 1,233,365.11/1,318
  6. Step 6: Final answer
    x = 935.79

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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.