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Finding the Fourth Proportional to 323,990.40, 485,985.60 and 278,889.60

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Solution

The fourth proportional to 323,990.40, 485,985.60 and 278,889.60 is: 418,334.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,990.40 : 485,985.60 = 278,889.60 : x
  2. Step 2: Convert to fraction form
    323,990.40/485,985.60 = 278,889.60/x
  3. Step 3: Cross multiply
    323,990.40x = 485,985.60 × 278,889.60
  4. Step 4: Simplify right side
    323,990.40x = 135,536,329,589.76
  5. Step 5: Solve for x
    x = 135,536,329,589.76/323,990.40
  6. Step 6: Final answer
    x = 418,334.40

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1.5x scale

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.