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Finding the Fourth Proportional to 18,963.31, 28,448.04 and 7,118.01

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Solution

The fourth proportional to 18,963.31, 28,448.04 and 7,118.01 is: 10,678.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.31 : 28,448.04 = 7,118.01 : x
  2. Step 2: Convert to fraction form
    18,963.31/28,448.04 = 7,118.01/x
  3. Step 3: Cross multiply
    18,963.31x = 28,448.04 × 7,118.01
  4. Step 4: Simplify right side
    18,963.31x = 202,493,433.20
  5. Step 5: Solve for x
    x = 202,493,433.20/18,963.31
  6. Step 6: Final answer
    x = 10,678.17

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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.