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Finding the Fourth Proportional to 21,800.50, 30,084.69 and 11,864.50

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Solution

The fourth proportional to 21,800.50, 30,084.69 and 11,864.50 is: 16,373.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,800.50 : 30,084.69 = 11,864.50 : x
  2. Step 2: Convert to fraction form
    21,800.50/30,084.69 = 11,864.50/x
  3. Step 3: Cross multiply
    21,800.50x = 30,084.69 × 11,864.50
  4. Step 4: Simplify right side
    21,800.50x = 356,939,804.51
  5. Step 5: Solve for x
    x = 356,939,804.51/21,800.50
  6. Step 6: Final answer
    x = 16,373.01

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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.