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Finding the Fourth Proportional to 387.61, 535.59 and 276.90

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Solution

The fourth proportional to 387.61, 535.59 and 276.90 is: 382.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.61 : 535.59 = 276.90 : x
  2. Step 2: Convert to fraction form
    387.61/535.59 = 276.90/x
  3. Step 3: Cross multiply
    387.61x = 535.59 × 276.90
  4. Step 4: Simplify right side
    387.61x = 148,304.87
  5. Step 5: Solve for x
    x = 148,304.87/387.61
  6. Step 6: Final answer
    x = 382.61

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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.