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Finding the Fourth Proportional to 978,078.40, 1,469,450.40 and 875,435.20

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Solution

The fourth proportional to 978,078.40, 1,469,450.40 and 875,435.20 is: 1,315,240.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,078.40 : 1,469,450.40 = 875,435.20 : x
  2. Step 2: Convert to fraction form
    978,078.40/1,469,450.40 = 875,435.20/x
  3. Step 3: Cross multiply
    978,078.40x = 1,469,450.40 × 875,435.20
  4. Step 4: Simplify right side
    978,078.40x = 1,286,408,604,814.08
  5. Step 5: Solve for x
    x = 1,286,408,604,814.08/978,078.40
  6. Step 6: Final answer
    x = 1,315,240.79

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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.