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Finding the Fourth Proportional to 387.70, 535.24 and 256.94

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Solution

The fourth proportional to 387.70, 535.24 and 256.94 is: 354.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.70 : 535.24 = 256.94 : x
  2. Step 2: Convert to fraction form
    387.70/535.24 = 256.94/x
  3. Step 3: Cross multiply
    387.70x = 535.24 × 256.94
  4. Step 4: Simplify right side
    387.70x = 137,524.57
  5. Step 5: Solve for x
    x = 137,524.57/387.70
  6. Step 6: Final answer
    x = 354.72

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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.