Home / 13,139.55-18,132.09-7,171.10

Finding the Fourth Proportional to 13,139.55, 18,132.09 and 7,171.10

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Solution

The fourth proportional to 13,139.55, 18,132.09 and 7,171.10 is: 9,895.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.55 : 18,132.09 = 7,171.10 : x
  2. Step 2: Convert to fraction form
    13,139.55/18,132.09 = 7,171.10/x
  3. Step 3: Cross multiply
    13,139.55x = 18,132.09 × 7,171.10
  4. Step 4: Simplify right side
    13,139.55x = 130,026,981.04
  5. Step 5: Solve for x
    x = 130,026,981.04/13,139.55
  6. Step 6: Final answer
    x = 9,895.85

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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.