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Finding the Fourth Proportional to 425,574.64, 638,455.41 and 126,078.67

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Solution

The fourth proportional to 425,574.64, 638,455.41 and 126,078.67 is: 189,145.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,574.64 : 638,455.41 = 126,078.67 : x
  2. Step 2: Convert to fraction form
    425,574.64/638,455.41 = 126,078.67/x
  3. Step 3: Cross multiply
    425,574.64x = 638,455.41 × 126,078.67
  4. Step 4: Simplify right side
    425,574.64x = 80,495,608,947.10
  5. Step 5: Solve for x
    x = 80,495,608,947.10/425,574.64
  6. Step 6: Final answer
    x = 189,145.69

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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.