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Finding the Fourth Proportional to 67,075.81, 100,620.63 and 19,690.72

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Solution

The fourth proportional to 67,075.81, 100,620.63 and 19,690.72 is: 29,538.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,075.81 : 100,620.63 = 19,690.72 : x
  2. Step 2: Convert to fraction form
    67,075.81/100,620.63 = 19,690.72/x
  3. Step 3: Cross multiply
    67,075.81x = 100,620.63 × 19,690.72
  4. Step 4: Simplify right side
    67,075.81x = 1,981,292,326.16
  5. Step 5: Solve for x
    x = 1,981,292,326.16/67,075.81
  6. Step 6: Final answer
    x = 29,538.10

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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.