Home / 13,139.28-18,132.60-7,171.34

Finding the Fourth Proportional to 13,139.28, 18,132.60 and 7,171.34

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Solution

The fourth proportional to 13,139.28, 18,132.60 and 7,171.34 is: 9,896.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.28 : 18,132.60 = 7,171.34 : x
  2. Step 2: Convert to fraction form
    13,139.28/18,132.60 = 7,171.34/x
  3. Step 3: Cross multiply
    13,139.28x = 18,132.60 × 7,171.34
  4. Step 4: Simplify right side
    13,139.28x = 130,034,913.16
  5. Step 5: Solve for x
    x = 130,034,913.16/13,139.28
  6. Step 6: Final answer
    x = 9,896.65

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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.