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Finding the Fourth Proportional to 1,361.71, 1,879.20 and 802.20

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Solution

The fourth proportional to 1,361.71, 1,879.20 and 802.20 is: 1,107.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.71 : 1,879.20 = 802.20 : x
  2. Step 2: Convert to fraction form
    1,361.71/1,879.20 = 802.20/x
  3. Step 3: Cross multiply
    1,361.71x = 1,879.20 × 802.20
  4. Step 4: Simplify right side
    1,361.71x = 1,507,501.29
  5. Step 5: Solve for x
    x = 1,507,501.29/1,361.71
  6. Step 6: Final answer
    x = 1,107.06

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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.