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Finding the Fourth Proportional to 423.28, 632.59 and 390.44

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Solution

The fourth proportional to 423.28, 632.59 and 390.44 is: 583.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.28 : 632.59 = 390.44 : x
  2. Step 2: Convert to fraction form
    423.28/632.59 = 390.44/x
  3. Step 3: Cross multiply
    423.28x = 632.59 × 390.44
  4. Step 4: Simplify right side
    423.28x = 246,986.49
  5. Step 5: Solve for x
    x = 246,986.49/423.28
  6. Step 6: Final answer
    x = 583.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.