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Finding the Fourth Proportional to 12,402.75, 17,115.80 and 6,813.75

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Solution

The fourth proportional to 12,402.75, 17,115.80 and 6,813.75 is: 9,402.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,402.75 : 17,115.80 = 6,813.75 : x
  2. Step 2: Convert to fraction form
    12,402.75/17,115.80 = 6,813.75/x
  3. Step 3: Cross multiply
    12,402.75x = 17,115.80 × 6,813.75
  4. Step 4: Simplify right side
    12,402.75x = 116,622,782.25
  5. Step 5: Solve for x
    x = 116,622,782.25/12,402.75
  6. Step 6: Final answer
    x = 9,402.98

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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.