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Finding the Fourth Proportional to 777,761.50, 1,073,311.28 and 420,065.50

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Solution

The fourth proportional to 777,761.50, 1,073,311.28 and 420,065.50 is: 579,690.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    777,761.50 : 1,073,311.28 = 420,065.50 : x
  2. Step 2: Convert to fraction form
    777,761.50/1,073,311.28 = 420,065.50/x
  3. Step 3: Cross multiply
    777,761.50x = 1,073,311.28 × 420,065.50
  4. Step 4: Simplify right side
    777,761.50x = 450,861,039,488.84
  5. Step 5: Solve for x
    x = 450,861,039,488.84/777,761.50
  6. Step 6: Final answer
    x = 579,690.61

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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.