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Finding the Fourth Proportional to 1,321,987.84, 1,978,082.88 and 789,798.40

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Solution

The fourth proportional to 1,321,987.84, 1,978,082.88 and 789,798.40 is: 1,181,770.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321,987.84 : 1,978,082.88 = 789,798.40 : x
  2. Step 2: Convert to fraction form
    1,321,987.84/1,978,082.88 = 789,798.40/x
  3. Step 3: Cross multiply
    1,321,987.84x = 1,978,082.88 × 789,798.40
  4. Step 4: Simplify right side
    1,321,987.84x = 1,562,286,693,691.39
  5. Step 5: Solve for x
    x = 1,562,286,693,691.39/1,321,987.84
  6. Step 6: Final answer
    x = 1,181,770.85

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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.