Home / 12,785.29-17,643.21-7,120.28

Finding the Fourth Proportional to 12,785.29, 17,643.21 and 7,120.28

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Solution

The fourth proportional to 12,785.29, 17,643.21 and 7,120.28 is: 9,825.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,785.29 : 17,643.21 = 7,120.28 : x
  2. Step 2: Convert to fraction form
    12,785.29/17,643.21 = 7,120.28/x
  3. Step 3: Cross multiply
    12,785.29x = 17,643.21 × 7,120.28
  4. Step 4: Simplify right side
    12,785.29x = 125,624,533.39
  5. Step 5: Solve for x
    x = 125,624,533.39/12,785.29
  6. Step 6: Final answer
    x = 9,825.71

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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.