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Finding the Fourth Proportional to 18,865.97, 28,303.82 and 7,172.81

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Solution

The fourth proportional to 18,865.97, 28,303.82 and 7,172.81 is: 10,761.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,865.97 : 28,303.82 = 7,172.81 : x
  2. Step 2: Convert to fraction form
    18,865.97/28,303.82 = 7,172.81/x
  3. Step 3: Cross multiply
    18,865.97x = 28,303.82 × 7,172.81
  4. Step 4: Simplify right side
    18,865.97x = 203,017,923.13
  5. Step 5: Solve for x
    x = 203,017,923.13/18,865.97
  6. Step 6: Final answer
    x = 10,761.06

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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.