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Finding the Fourth Proportional to 433.08, 648 and 387.72

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Solution

The fourth proportional to 433.08, 648 and 387.72 is: 580.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    433.08 : 648 = 387.72 : x
  2. Step 2: Convert to fraction form
    433.08/648 = 387.72/x
  3. Step 3: Cross multiply
    433.08x = 648 × 387.72
  4. Step 4: Simplify right side
    433.08x = 251,242.56
  5. Step 5: Solve for x
    x = 251,242.56/433.08
  6. Step 6: Final answer
    x = 580.13

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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.