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Finding the Fourth Proportional to 12,855.02, 17,739.57 and 7,189.78

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Solution

The fourth proportional to 12,855.02, 17,739.57 and 7,189.78 is: 9,921.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,855.02 : 17,739.57 = 7,189.78 : x
  2. Step 2: Convert to fraction form
    12,855.02/17,739.57 = 7,189.78/x
  3. Step 3: Cross multiply
    12,855.02x = 17,739.57 × 7,189.78
  4. Step 4: Simplify right side
    12,855.02x = 127,543,621.47
  5. Step 5: Solve for x
    x = 127,543,621.47/12,855.02
  6. Step 6: Final answer
    x = 9,921.70

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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.