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Finding the Fourth Proportional to 387.68, 534.48 and 256.64

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Solution

The fourth proportional to 387.68, 534.48 and 256.64 is: 353.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.68 : 534.48 = 256.64 : x
  2. Step 2: Convert to fraction form
    387.68/534.48 = 256.64/x
  3. Step 3: Cross multiply
    387.68x = 534.48 × 256.64
  4. Step 4: Simplify right side
    387.68x = 137,168.95
  5. Step 5: Solve for x
    x = 137,168.95/387.68
  6. Step 6: Final answer
    x = 353.82

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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.