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Finding the Fourth Proportional to 123,772.80, 185,659.20 and 81,782.40

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Solution

The fourth proportional to 123,772.80, 185,659.20 and 81,782.40 is: 122,673.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,772.80 : 185,659.20 = 81,782.40 : x
  2. Step 2: Convert to fraction form
    123,772.80/185,659.20 = 81,782.40/x
  3. Step 3: Cross multiply
    123,772.80x = 185,659.20 × 81,782.40
  4. Step 4: Simplify right side
    123,772.80x = 15,183,654,958.08
  5. Step 5: Solve for x
    x = 15,183,654,958.08/123,772.80
  6. Step 6: Final answer
    x = 122,673.60

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1.5x scale

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.