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Finding the Fourth Proportional to 19,153.71, 28,718.82 and 7,905.56

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Solution

The fourth proportional to 19,153.71, 28,718.82 and 7,905.56 is: 11,853.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,153.71 : 28,718.82 = 7,905.56 : x
  2. Step 2: Convert to fraction form
    19,153.71/28,718.82 = 7,905.56/x
  3. Step 3: Cross multiply
    19,153.71x = 28,718.82 × 7,905.56
  4. Step 4: Simplify right side
    19,153.71x = 227,038,211.05
  5. Step 5: Solve for x
    x = 227,038,211.05/19,153.71
  6. Step 6: Final answer
    x = 11,853.48

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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.