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Finding the Fourth Proportional to 12,921.12, 17,830.56 and 7,256.64

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Solution

The fourth proportional to 12,921.12, 17,830.56 and 7,256.64 is: 10,013.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921.12 : 17,830.56 = 7,256.64 : x
  2. Step 2: Convert to fraction form
    12,921.12/17,830.56 = 7,256.64/x
  3. Step 3: Cross multiply
    12,921.12x = 17,830.56 × 7,256.64
  4. Step 4: Simplify right side
    12,921.12x = 129,389,954.92
  5. Step 5: Solve for x
    x = 129,389,954.92/12,921.12
  6. Step 6: Final answer
    x = 10,013.83

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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.