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Finding the Fourth Proportional to 14,642.39, 20,206.55 and 7,928.09

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Solution

The fourth proportional to 14,642.39, 20,206.55 and 7,928.09 is: 10,940.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,642.39 : 20,206.55 = 7,928.09 : x
  2. Step 2: Convert to fraction form
    14,642.39/20,206.55 = 7,928.09/x
  3. Step 3: Cross multiply
    14,642.39x = 20,206.55 × 7,928.09
  4. Step 4: Simplify right side
    14,642.39x = 160,199,307.35
  5. Step 5: Solve for x
    x = 160,199,307.35/14,642.39
  6. Step 6: Final answer
    x = 10,940.79

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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.