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Finding the Fourth Proportional to 490,860, 677,579.72 and 309,535.83

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Solution

The fourth proportional to 490,860, 677,579.72 and 309,535.83 is: 427,281.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,860 : 677,579.72 = 309,535.83 : x
  2. Step 2: Convert to fraction form
    490,860/677,579.72 = 309,535.83/x
  3. Step 3: Cross multiply
    490,860x = 677,579.72 × 309,535.83
  4. Step 4: Simplify right side
    490,860x = 209,735,199,473.69
  5. Step 5: Solve for x
    x = 209,735,199,473.69/490,860
  6. Step 6: Final answer
    x = 427,281.10

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1.5x scale

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.