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Finding the Fourth Proportional to 323,643.70, 485,465.55 and 289,429.30

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Solution

The fourth proportional to 323,643.70, 485,465.55 and 289,429.30 is: 434,143.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,643.70 : 485,465.55 = 289,429.30 : x
  2. Step 2: Convert to fraction form
    323,643.70/485,465.55 = 289,429.30/x
  3. Step 3: Cross multiply
    323,643.70x = 485,465.55 × 289,429.30
  4. Step 4: Simplify right side
    323,643.70x = 140,507,954,310.62
  5. Step 5: Solve for x
    x = 140,507,954,310.62/323,643.70
  6. Step 6: Final answer
    x = 434,143.95

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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.