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Finding the Fourth Proportional to 339,989.80, 509,984.70 and 280,892.20

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Solution

The fourth proportional to 339,989.80, 509,984.70 and 280,892.20 is: 421,338.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,989.80 : 509,984.70 = 280,892.20 : x
  2. Step 2: Convert to fraction form
    339,989.80/509,984.70 = 280,892.20/x
  3. Step 3: Cross multiply
    339,989.80x = 509,984.70 × 280,892.20
  4. Step 4: Simplify right side
    339,989.80x = 143,250,724,349.34
  5. Step 5: Solve for x
    x = 143,250,724,349.34/339,989.80
  6. Step 6: Final answer
    x = 421,338.30

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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.