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Finding the Fourth Proportional to 13,578.22, 18,737.90 and 7,916.32

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Solution

The fourth proportional to 13,578.22, 18,737.90 and 7,916.32 is: 10,924.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,578.22 : 18,737.90 = 7,916.32 : x
  2. Step 2: Convert to fraction form
    13,578.22/18,737.90 = 7,916.32/x
  3. Step 3: Cross multiply
    13,578.22x = 18,737.90 × 7,916.32
  4. Step 4: Simplify right side
    13,578.22x = 148,335,169.31
  5. Step 5: Solve for x
    x = 148,335,169.31/13,578.22
  6. Step 6: Final answer
    x = 10,924.49

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1.5x scale

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.