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Finding the Fourth Proportional to 983.99, 1,474.97 and 436.56

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Solution

The fourth proportional to 983.99, 1,474.97 and 436.56 is: 654.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.99 : 1,474.97 = 436.56 : x
  2. Step 2: Convert to fraction form
    983.99/1,474.97 = 436.56/x
  3. Step 3: Cross multiply
    983.99x = 1,474.97 × 436.56
  4. Step 4: Simplify right side
    983.99x = 643,910.72
  5. Step 5: Solve for x
    x = 643,910.72/983.99
  6. Step 6: Final answer
    x = 654.39

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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.