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Finding the Fourth Proportional to 1,319,087.80, 1,978,631.70 and 321,815.80

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Solution

The fourth proportional to 1,319,087.80, 1,978,631.70 and 321,815.80 is: 482,723.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,087.80 : 1,978,631.70 = 321,815.80 : x
  2. Step 2: Convert to fraction form
    1,319,087.80/1,978,631.70 = 321,815.80/x
  3. Step 3: Cross multiply
    1,319,087.80x = 1,978,631.70 × 321,815.80
  4. Step 4: Simplify right side
    1,319,087.80x = 636,754,943,440.86
  5. Step 5: Solve for x
    x = 636,754,943,440.86/1,319,087.80
  6. Step 6: Final answer
    x = 482,723.70

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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.