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Finding the Fourth Proportional to 280,660.70, 420,991.05 and 280,660.70

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Solution

The fourth proportional to 280,660.70, 420,991.05 and 280,660.70 is: 420,991.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,660.70 : 420,991.05 = 280,660.70 : x
  2. Step 2: Convert to fraction form
    280,660.70/420,991.05 = 280,660.70/x
  3. Step 3: Cross multiply
    280,660.70x = 420,991.05 × 280,660.70
  4. Step 4: Simplify right side
    280,660.70x = 118,155,642,786.74
  5. Step 5: Solve for x
    x = 118,155,642,786.74/280,660.70
  6. Step 6: Final answer
    x = 420,991.05

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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.