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Finding the Fourth Proportional to 12,425.60, 17,147.04 and 7,121.60

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Solution

The fourth proportional to 12,425.60, 17,147.04 and 7,121.60 is: 9,827.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,425.60 : 17,147.04 = 7,121.60 : x
  2. Step 2: Convert to fraction form
    12,425.60/17,147.04 = 7,121.60/x
  3. Step 3: Cross multiply
    12,425.60x = 17,147.04 × 7,121.60
  4. Step 4: Simplify right side
    12,425.60x = 122,114,360.06
  5. Step 5: Solve for x
    x = 122,114,360.06/12,425.60
  6. Step 6: Final answer
    x = 9,827.64

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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.