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Finding the Fourth Proportional to 387.81, 535.21 and 240.46

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Solution

The fourth proportional to 387.81, 535.21 and 240.46 is: 331.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.81 : 535.21 = 240.46 : x
  2. Step 2: Convert to fraction form
    387.81/535.21 = 240.46/x
  3. Step 3: Cross multiply
    387.81x = 535.21 × 240.46
  4. Step 4: Simplify right side
    387.81x = 128,696.60
  5. Step 5: Solve for x
    x = 128,696.60/387.81
  6. Step 6: Final answer
    x = 331.85

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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.