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Finding the Fourth Proportional to 387.82, 534.81 and 256.87

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Solution

The fourth proportional to 387.82, 534.81 and 256.87 is: 354.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.82 : 534.81 = 256.87 : x
  2. Step 2: Convert to fraction form
    387.82/534.81 = 256.87/x
  3. Step 3: Cross multiply
    387.82x = 534.81 × 256.87
  4. Step 4: Simplify right side
    387.82x = 137,376.64
  5. Step 5: Solve for x
    x = 137,376.64/387.82
  6. Step 6: Final answer
    x = 354.23

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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.