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Finding the Fourth Proportional to 402.66, 555.42 and 276.57

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Solution

The fourth proportional to 402.66, 555.42 and 276.57 is: 381.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.66 : 555.42 = 276.57 : x
  2. Step 2: Convert to fraction form
    402.66/555.42 = 276.57/x
  3. Step 3: Cross multiply
    402.66x = 555.42 × 276.57
  4. Step 4: Simplify right side
    402.66x = 153,608.35
  5. Step 5: Solve for x
    x = 153,608.35/402.66
  6. Step 6: Final answer
    x = 381.48

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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.