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Finding the Fourth Proportional to 12,928.40, 17,841.08 and 7,891.56

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Solution

The fourth proportional to 12,928.40, 17,841.08 and 7,891.56 is: 10,890.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,928.40 : 17,841.08 = 7,891.56 : x
  2. Step 2: Convert to fraction form
    12,928.40/17,841.08 = 7,891.56/x
  3. Step 3: Cross multiply
    12,928.40x = 17,841.08 × 7,891.56
  4. Step 4: Simplify right side
    12,928.40x = 140,793,953.28
  5. Step 5: Solve for x
    x = 140,793,953.28/12,928.40
  6. Step 6: Final answer
    x = 10,890.28

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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.