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Finding the Fourth Proportional to 279,603.40, 419,405.10 and 139,635.40

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Solution

The fourth proportional to 279,603.40, 419,405.10 and 139,635.40 is: 209,453.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,603.40 : 419,405.10 = 139,635.40 : x
  2. Step 2: Convert to fraction form
    279,603.40/419,405.10 = 139,635.40/x
  3. Step 3: Cross multiply
    279,603.40x = 419,405.10 × 139,635.40
  4. Step 4: Simplify right side
    279,603.40x = 58,563,798,900.54
  5. Step 5: Solve for x
    x = 58,563,798,900.54/279,603.40
  6. Step 6: Final answer
    x = 209,453.10

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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.