Home / 13,391.25-18,478.87-7,422.81

Finding the Fourth Proportional to 13,391.25, 18,478.87 and 7,422.81

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Solution

The fourth proportional to 13,391.25, 18,478.87 and 7,422.81 is: 10,242.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,391.25 : 18,478.87 = 7,422.81 : x
  2. Step 2: Convert to fraction form
    13,391.25/18,478.87 = 7,422.81/x
  3. Step 3: Cross multiply
    13,391.25x = 18,478.87 × 7,422.81
  4. Step 4: Simplify right side
    13,391.25x = 137,165,141.02
  5. Step 5: Solve for x
    x = 137,165,141.02/13,391.25
  6. Step 6: Final answer
    x = 10,242.89

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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.