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Finding the Fourth Proportional to 777,718.80, 1,073,251.72 and 420,022.80

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Solution

The fourth proportional to 777,718.80, 1,073,251.72 and 420,022.80 is: 579,631.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    777,718.80 : 1,073,251.72 = 420,022.80 : x
  2. Step 2: Convert to fraction form
    777,718.80/1,073,251.72 = 420,022.80/x
  3. Step 3: Cross multiply
    777,718.80x = 1,073,251.72 × 420,022.80
  4. Step 4: Simplify right side
    777,718.80x = 450,790,192,539.22
  5. Step 5: Solve for x
    x = 450,790,192,539.22/777,718.80
  6. Step 6: Final answer
    x = 579,631.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.