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Finding the Fourth Proportional to 777,976.78, 1,073,607.06 and 420,280.78

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Solution

The fourth proportional to 777,976.78, 1,073,607.06 and 420,280.78 is: 579,986.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    777,976.78 : 1,073,607.06 = 420,280.78 : x
  2. Step 2: Convert to fraction form
    777,976.78/1,073,607.06 = 420,280.78/x
  3. Step 3: Cross multiply
    777,976.78x = 1,073,607.06 × 420,280.78
  4. Step 4: Simplify right side
    777,976.78x = 451,216,412,590.31
  5. Step 5: Solve for x
    x = 451,216,412,590.31/777,976.78
  6. Step 6: Final answer
    x = 579,986.99

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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.