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Finding the Fourth Proportional to 428.19, 641.53 and 383.37

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Solution

The fourth proportional to 428.19, 641.53 and 383.37 is: 574.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.19 : 641.53 = 383.37 : x
  2. Step 2: Convert to fraction form
    428.19/641.53 = 383.37/x
  3. Step 3: Cross multiply
    428.19x = 641.53 × 383.37
  4. Step 4: Simplify right side
    428.19x = 245,943.36
  5. Step 5: Solve for x
    x = 245,943.36/428.19
  6. Step 6: Final answer
    x = 574.38

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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.