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Finding the Fourth Proportional to 2,651.76, 3,976.40 and 802.40

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Solution

The fourth proportional to 2,651.76, 3,976.40 and 802.40 is: 1,203.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,651.76 : 3,976.40 = 802.40 : x
  2. Step 2: Convert to fraction form
    2,651.76/3,976.40 = 802.40/x
  3. Step 3: Cross multiply
    2,651.76x = 3,976.40 × 802.40
  4. Step 4: Simplify right side
    2,651.76x = 3,190,663.36
  5. Step 5: Solve for x
    x = 3,190,663.36/2,651.76
  6. Step 6: Final answer
    x = 1,203.22

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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.