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Finding the Fourth Proportional to 280,111.80, 420,221.70 and 120,185.40

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Solution

The fourth proportional to 280,111.80, 420,221.70 and 120,185.40 is: 180,301.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,111.80 : 420,221.70 = 120,185.40 : x
  2. Step 2: Convert to fraction form
    280,111.80/420,221.70 = 120,185.40/x
  3. Step 3: Cross multiply
    280,111.80x = 420,221.70 × 120,185.40
  4. Step 4: Simplify right side
    280,111.80x = 50,504,513,103.18
  5. Step 5: Solve for x
    x = 50,504,513,103.18/280,111.80
  6. Step 6: Final answer
    x = 180,301.27

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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.