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Finding the Fourth Proportional to 984.72, 1,476.90 and 399.99

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Solution

The fourth proportional to 984.72, 1,476.90 and 399.99 is: 599.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.72 : 1,476.90 = 399.99 : x
  2. Step 2: Convert to fraction form
    984.72/1,476.90 = 399.99/x
  3. Step 3: Cross multiply
    984.72x = 1,476.90 × 399.99
  4. Step 4: Simplify right side
    984.72x = 590,745.23
  5. Step 5: Solve for x
    x = 590,745.23/984.72
  6. Step 6: Final answer
    x = 599.91

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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.