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Finding the Fourth Proportional to 14,642.57, 20,206.72 and 7,928.20

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Solution

The fourth proportional to 14,642.57, 20,206.72 and 7,928.20 is: 10,940.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,642.57 : 20,206.72 = 7,928.20 : x
  2. Step 2: Convert to fraction form
    14,642.57/20,206.72 = 7,928.20/x
  3. Step 3: Cross multiply
    14,642.57x = 20,206.72 × 7,928.20
  4. Step 4: Simplify right side
    14,642.57x = 160,202,877.86
  5. Step 5: Solve for x
    x = 160,202,877.86/14,642.57
  6. Step 6: Final answer
    x = 10,940.90

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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.