Home / 12,840.36-17,720.10-7,251.72

Finding the Fourth Proportional to 12,840.36, 17,720.10 and 7,251.72

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Solution

The fourth proportional to 12,840.36, 17,720.10 and 7,251.72 is: 10,007.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840.36 : 17,720.10 = 7,251.72 : x
  2. Step 2: Convert to fraction form
    12,840.36/17,720.10 = 7,251.72/x
  3. Step 3: Cross multiply
    12,840.36x = 17,720.10 × 7,251.72
  4. Step 4: Simplify right side
    12,840.36x = 128,501,203.57
  5. Step 5: Solve for x
    x = 128,501,203.57/12,840.36
  6. Step 6: Final answer
    x = 10,007.60

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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.