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Finding the Fourth Proportional to 402.50, 555.54 and 276.64

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Solution

The fourth proportional to 402.50, 555.54 and 276.64 is: 381.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.50 : 555.54 = 276.64 : x
  2. Step 2: Convert to fraction form
    402.50/555.54 = 276.64/x
  3. Step 3: Cross multiply
    402.50x = 555.54 × 276.64
  4. Step 4: Simplify right side
    402.50x = 153,684.59
  5. Step 5: Solve for x
    x = 153,684.59/402.50
  6. Step 6: Final answer
    x = 381.83

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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.