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Finding the Fourth Proportional to 12,891.16, 17,789.80 and 7,855.40

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Solution

The fourth proportional to 12,891.16, 17,789.80 and 7,855.40 is: 10,840.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.16 : 17,789.80 = 7,855.40 : x
  2. Step 2: Convert to fraction form
    12,891.16/17,789.80 = 7,855.40/x
  3. Step 3: Cross multiply
    12,891.16x = 17,789.80 × 7,855.40
  4. Step 4: Simplify right side
    12,891.16x = 139,745,994.92
  5. Step 5: Solve for x
    x = 139,745,994.92/12,891.16
  6. Step 6: Final answer
    x = 10,840.45

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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.