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Finding the Fourth Proportional to 389,991.72, 585,075.06 and 123,760.92

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Solution

The fourth proportional to 389,991.72, 585,075.06 and 123,760.92 is: 185,669.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,991.72 : 585,075.06 = 123,760.92 : x
  2. Step 2: Convert to fraction form
    389,991.72/585,075.06 = 123,760.92/x
  3. Step 3: Cross multiply
    389,991.72x = 585,075.06 × 123,760.92
  4. Step 4: Simplify right side
    389,991.72x = 72,409,427,694.66
  5. Step 5: Solve for x
    x = 72,409,427,694.66/389,991.72
  6. Step 6: Final answer
    x = 185,669.14

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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.