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Finding the Fourth Proportional to 12,939.40, 19,417.10 and 5,147.40

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Solution

The fourth proportional to 12,939.40, 19,417.10 and 5,147.40 is: 7,724.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.40 : 19,417.10 = 5,147.40 : x
  2. Step 2: Convert to fraction form
    12,939.40/19,417.10 = 5,147.40/x
  3. Step 3: Cross multiply
    12,939.40x = 19,417.10 × 5,147.40
  4. Step 4: Simplify right side
    12,939.40x = 99,947,580.54
  5. Step 5: Solve for x
    x = 99,947,580.54/12,939.40
  6. Step 6: Final answer
    x = 7,724.28

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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.