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Finding the Fourth Proportional to 21,006, 31,505.76 and 6,972.12

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Solution

The fourth proportional to 21,006, 31,505.76 and 6,972.12 is: 10,457.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006 : 31,505.76 = 6,972.12 : x
  2. Step 2: Convert to fraction form
    21,006/31,505.76 = 6,972.12/x
  3. Step 3: Cross multiply
    21,006x = 31,505.76 × 6,972.12
  4. Step 4: Simplify right side
    21,006x = 219,661,939.41
  5. Step 5: Solve for x
    x = 219,661,939.41/21,006
  6. Step 6: Final answer
    x = 10,457.10

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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.