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Finding the Fourth Proportional to 2,548.78, 3,823.60 and 817

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Solution

The fourth proportional to 2,548.78, 3,823.60 and 817 is: 1,225.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,548.78 : 3,823.60 = 817 : x
  2. Step 2: Convert to fraction form
    2,548.78/3,823.60 = 817/x
  3. Step 3: Cross multiply
    2,548.78x = 3,823.60 × 817
  4. Step 4: Simplify right side
    2,548.78x = 3,123,881.20
  5. Step 5: Solve for x
    x = 3,123,881.20/2,548.78
  6. Step 6: Final answer
    x = 1,225.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.