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Finding the Fourth Proportional to 81,075.83, 121,620.21 and 28,497.11

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Solution

The fourth proportional to 81,075.83, 121,620.21 and 28,497.11 is: 42,747.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,075.83 : 121,620.21 = 28,497.11 : x
  2. Step 2: Convert to fraction form
    81,075.83/121,620.21 = 28,497.11/x
  3. Step 3: Cross multiply
    81,075.83x = 121,620.21 × 28,497.11
  4. Step 4: Simplify right side
    81,075.83x = 3,465,823,894.49
  5. Step 5: Solve for x
    x = 3,465,823,894.49/81,075.83
  6. Step 6: Final answer
    x = 42,747.93

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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.