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Finding the Fourth Proportional to 18,689.77, 28,039.16 and 7,003.09

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Solution

The fourth proportional to 18,689.77, 28,039.16 and 7,003.09 is: 10,506.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.77 : 28,039.16 = 7,003.09 : x
  2. Step 2: Convert to fraction form
    18,689.77/28,039.16 = 7,003.09/x
  3. Step 3: Cross multiply
    18,689.77x = 28,039.16 × 7,003.09
  4. Step 4: Simplify right side
    18,689.77x = 196,360,761.00
  5. Step 5: Solve for x
    x = 196,360,761.00/18,689.77
  6. Step 6: Final answer
    x = 10,506.32

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1.5x scale

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.