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Finding the Fourth Proportional to 280,635.40, 421,989.90 and 235,016.20

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Solution

The fourth proportional to 280,635.40, 421,989.90 and 235,016.20 is: 353,392.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,635.40 : 421,989.90 = 235,016.20 : x
  2. Step 2: Convert to fraction form
    280,635.40/421,989.90 = 235,016.20/x
  3. Step 3: Cross multiply
    280,635.40x = 421,989.90 × 235,016.20
  4. Step 4: Simplify right side
    280,635.40x = 99,174,462,736.38
  5. Step 5: Solve for x
    x = 99,174,462,736.38/280,635.40
  6. Step 6: Final answer
    x = 353,392.56

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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.