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Finding the Fourth Proportional to 21,006, 28,988.40 and 14,641.92

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Solution

The fourth proportional to 21,006, 28,988.40 and 14,641.92 is: 20,205.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006 : 28,988.40 = 14,641.92 : x
  2. Step 2: Convert to fraction form
    21,006/28,988.40 = 14,641.92/x
  3. Step 3: Cross multiply
    21,006x = 28,988.40 × 14,641.92
  4. Step 4: Simplify right side
    21,006x = 424,445,833.73
  5. Step 5: Solve for x
    x = 424,445,833.73/21,006
  6. Step 6: Final answer
    x = 20,205.93

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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.