Home / 7,129.12-9,836.64-3,985.20

Finding the Fourth Proportional to 7,129.12, 9,836.64 and 3,985.20

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Solution

The fourth proportional to 7,129.12, 9,836.64 and 3,985.20 is: 5,498.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.12 : 9,836.64 = 3,985.20 : x
  2. Step 2: Convert to fraction form
    7,129.12/9,836.64 = 3,985.20/x
  3. Step 3: Cross multiply
    7,129.12x = 9,836.64 × 3,985.20
  4. Step 4: Simplify right side
    7,129.12x = 39,200,977.73
  5. Step 5: Solve for x
    x = 39,200,977.73/7,129.12
  6. Step 6: Final answer
    x = 5,498.71

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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.