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Finding the Fourth Proportional to 12,898.40, 19,304.40 and 11,343.20

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Solution

The fourth proportional to 12,898.40, 19,304.40 and 11,343.20 is: 16,976.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,898.40 : 19,304.40 = 11,343.20 : x
  2. Step 2: Convert to fraction form
    12,898.40/19,304.40 = 11,343.20/x
  3. Step 3: Cross multiply
    12,898.40x = 19,304.40 × 11,343.20
  4. Step 4: Simplify right side
    12,898.40x = 218,973,670.08
  5. Step 5: Solve for x
    x = 218,973,670.08/12,898.40
  6. Step 6: Final answer
    x = 16,976.81

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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.