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Finding the Fourth Proportional to 12,279.12, 16,945.08 and 7,311.12

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Solution

The fourth proportional to 12,279.12, 16,945.08 and 7,311.12 is: 10,089.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.12 : 16,945.08 = 7,311.12 : x
  2. Step 2: Convert to fraction form
    12,279.12/16,945.08 = 7,311.12/x
  3. Step 3: Cross multiply
    12,279.12x = 16,945.08 × 7,311.12
  4. Step 4: Simplify right side
    12,279.12x = 123,887,513.29
  5. Step 5: Solve for x
    x = 123,887,513.29/12,279.12
  6. Step 6: Final answer
    x = 10,089.28

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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.