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Finding the Fourth Proportional to 19,812, 27,341.79 and 11,428.50

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Solution

The fourth proportional to 19,812, 27,341.79 and 11,428.50 is: 15,772.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,812 : 27,341.79 = 11,428.50 : x
  2. Step 2: Convert to fraction form
    19,812/27,341.79 = 11,428.50/x
  3. Step 3: Cross multiply
    19,812x = 27,341.79 × 11,428.50
  4. Step 4: Simplify right side
    19,812x = 312,475,647.02
  5. Step 5: Solve for x
    x = 312,475,647.02/19,812
  6. Step 6: Final answer
    x = 15,772.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.