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Finding the Fourth Proportional to 69,048.21, 103,574.61 and 19,128.81

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Solution

The fourth proportional to 69,048.21, 103,574.61 and 19,128.81 is: 28,693.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,048.21 : 103,574.61 = 19,128.81 : x
  2. Step 2: Convert to fraction form
    69,048.21/103,574.61 = 19,128.81/x
  3. Step 3: Cross multiply
    69,048.21x = 103,574.61 × 19,128.81
  4. Step 4: Simplify right side
    69,048.21x = 1,981,259,035.51
  5. Step 5: Solve for x
    x = 1,981,259,035.51/69,048.21
  6. Step 6: Final answer
    x = 28,693.85

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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.