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Finding the Fourth Proportional to 983.78, 1,474.34 and 544.36

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Solution

The fourth proportional to 983.78, 1,474.34 and 544.36 is: 815.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.78 : 1,474.34 = 544.36 : x
  2. Step 2: Convert to fraction form
    983.78/1,474.34 = 544.36/x
  3. Step 3: Cross multiply
    983.78x = 1,474.34 × 544.36
  4. Step 4: Simplify right side
    983.78x = 802,571.72
  5. Step 5: Solve for x
    x = 802,571.72/983.78
  6. Step 6: Final answer
    x = 815.80

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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.