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Finding the Fourth Proportional to 654.68, 903.21 and 399.08

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Solution

The fourth proportional to 654.68, 903.21 and 399.08 is: 550.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.68 : 903.21 = 399.08 : x
  2. Step 2: Convert to fraction form
    654.68/903.21 = 399.08/x
  3. Step 3: Cross multiply
    654.68x = 903.21 × 399.08
  4. Step 4: Simplify right side
    654.68x = 360,453.05
  5. Step 5: Solve for x
    x = 360,453.05/654.68
  6. Step 6: Final answer
    x = 550.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.