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Finding the Fourth Proportional to 28,920, 39,916.90 and 16,352.04

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Solution

The fourth proportional to 28,920, 39,916.90 and 16,352.04 is: 22,569.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,920 : 39,916.90 = 16,352.04 : x
  2. Step 2: Convert to fraction form
    28,920/39,916.90 = 16,352.04/x
  3. Step 3: Cross multiply
    28,920x = 39,916.90 × 16,352.04
  4. Step 4: Simplify right side
    28,920x = 652,722,745.48
  5. Step 5: Solve for x
    x = 652,722,745.48/28,920
  6. Step 6: Final answer
    x = 22,569.94

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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.