Home / 809,639.80-1,214,459.70-388,814.20

Finding the Fourth Proportional to 809,639.80, 1,214,459.70 and 388,814.20

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Solution

The fourth proportional to 809,639.80, 1,214,459.70 and 388,814.20 is: 583,221.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,639.80 : 1,214,459.70 = 388,814.20 : x
  2. Step 2: Convert to fraction form
    809,639.80/1,214,459.70 = 388,814.20/x
  3. Step 3: Cross multiply
    809,639.80x = 1,214,459.70 × 388,814.20
  4. Step 4: Simplify right side
    809,639.80x = 472,199,176,687.74
  5. Step 5: Solve for x
    x = 472,199,176,687.74/809,639.80
  6. Step 6: Final answer
    x = 583,221.30

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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.