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Finding the Fourth Proportional to 387.20, 534.02 and 328.34

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Solution

The fourth proportional to 387.20, 534.02 and 328.34 is: 452.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.20 : 534.02 = 328.34 : x
  2. Step 2: Convert to fraction form
    387.20/534.02 = 328.34/x
  3. Step 3: Cross multiply
    387.20x = 534.02 × 328.34
  4. Step 4: Simplify right side
    387.20x = 175,339.82
  5. Step 5: Solve for x
    x = 175,339.82/387.20
  6. Step 6: Final answer
    x = 452.84

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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.