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Finding the Fourth Proportional to 2,651.78, 3,977.70 and 802.88

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Solution

The fourth proportional to 2,651.78, 3,977.70 and 802.88 is: 1,204.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,651.78 : 3,977.70 = 802.88 : x
  2. Step 2: Convert to fraction form
    2,651.78/3,977.70 = 802.88/x
  3. Step 3: Cross multiply
    2,651.78x = 3,977.70 × 802.88
  4. Step 4: Simplify right side
    2,651.78x = 3,193,615.78
  5. Step 5: Solve for x
    x = 3,193,615.78/2,651.78
  6. Step 6: Final answer
    x = 1,204.33

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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.