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Finding the Fourth Proportional to 73,075.61, 109,617.36 and 20,489.20

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Solution

The fourth proportional to 73,075.61, 109,617.36 and 20,489.20 is: 30,734.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,075.61 : 109,617.36 = 20,489.20 : x
  2. Step 2: Convert to fraction form
    73,075.61/109,617.36 = 20,489.20/x
  3. Step 3: Cross multiply
    73,075.61x = 109,617.36 × 20,489.20
  4. Step 4: Simplify right side
    73,075.61x = 2,245,972,012.51
  5. Step 5: Solve for x
    x = 2,245,972,012.51/73,075.61
  6. Step 6: Final answer
    x = 30,734.91

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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.