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Finding the Fourth Proportional to 387.21, 534.60 and 240

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Solution

The fourth proportional to 387.21, 534.60 and 240 is: 331.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.21 : 534.60 = 240 : x
  2. Step 2: Convert to fraction form
    387.21/534.60 = 240/x
  3. Step 3: Cross multiply
    387.21x = 534.60 × 240
  4. Step 4: Simplify right side
    387.21x = 128,304
  5. Step 5: Solve for x
    x = 128,304/387.21
  6. Step 6: Final answer
    x = 331.36

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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.