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Finding the Fourth Proportional to 21,330, 29,435.40 and 11,898.56

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Solution

The fourth proportional to 21,330, 29,435.40 and 11,898.56 is: 16,420.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,330 : 29,435.40 = 11,898.56 : x
  2. Step 2: Convert to fraction form
    21,330/29,435.40 = 11,898.56/x
  3. Step 3: Cross multiply
    21,330x = 29,435.40 × 11,898.56
  4. Step 4: Simplify right side
    21,330x = 350,238,946.61
  5. Step 5: Solve for x
    x = 350,238,946.61/21,330
  6. Step 6: Final answer
    x = 16,420.02

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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.