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Finding the Fourth Proportional to 984.17, 1,475.83 and 399.30

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Solution

The fourth proportional to 984.17, 1,475.83 and 399.30 is: 598.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.17 : 1,475.83 = 399.30 : x
  2. Step 2: Convert to fraction form
    984.17/1,475.83 = 399.30/x
  3. Step 3: Cross multiply
    984.17x = 1,475.83 × 399.30
  4. Step 4: Simplify right side
    984.17x = 589,293.88
  5. Step 5: Solve for x
    x = 589,293.88/984.17
  6. Step 6: Final answer
    x = 598.78

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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.