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Finding the Fourth Proportional to 386.72, 532.90 and 328.40

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Solution

The fourth proportional to 386.72, 532.90 and 328.40 is: 452.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.72 : 532.90 = 328.40 : x
  2. Step 2: Convert to fraction form
    386.72/532.90 = 328.40/x
  3. Step 3: Cross multiply
    386.72x = 532.90 × 328.40
  4. Step 4: Simplify right side
    386.72x = 175,004.36
  5. Step 5: Solve for x
    x = 175,004.36/386.72
  6. Step 6: Final answer
    x = 452.54

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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.