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Finding the Fourth Proportional to 18,717.29, 28,075.86 and 7,621.36

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Solution

The fourth proportional to 18,717.29, 28,075.86 and 7,621.36 is: 11,432.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,717.29 : 28,075.86 = 7,621.36 : x
  2. Step 2: Convert to fraction form
    18,717.29/28,075.86 = 7,621.36/x
  3. Step 3: Cross multiply
    18,717.29x = 28,075.86 × 7,621.36
  4. Step 4: Simplify right side
    18,717.29x = 213,976,236.37
  5. Step 5: Solve for x
    x = 213,976,236.37/18,717.29
  6. Step 6: Final answer
    x = 11,432.01

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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.