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Finding the Fourth Proportional to 13,485.78, 20,232.62 and 6,916.55

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Solution

The fourth proportional to 13,485.78, 20,232.62 and 6,916.55 is: 10,376.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,485.78 : 20,232.62 = 6,916.55 : x
  2. Step 2: Convert to fraction form
    13,485.78/20,232.62 = 6,916.55/x
  3. Step 3: Cross multiply
    13,485.78x = 20,232.62 × 6,916.55
  4. Step 4: Simplify right side
    13,485.78x = 139,939,792.12
  5. Step 5: Solve for x
    x = 139,939,792.12/13,485.78
  6. Step 6: Final answer
    x = 10,376.84

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1.5x scale

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.