Home / 13,142.58-18,138.35-7,478.71

Finding the Fourth Proportional to 13,142.58, 18,138.35 and 7,478.71

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Solution

The fourth proportional to 13,142.58, 18,138.35 and 7,478.71 is: 10,321.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,142.58 : 18,138.35 = 7,478.71 : x
  2. Step 2: Convert to fraction form
    13,142.58/18,138.35 = 7,478.71/x
  3. Step 3: Cross multiply
    13,142.58x = 18,138.35 × 7,478.71
  4. Step 4: Simplify right side
    13,142.58x = 135,651,432.88
  5. Step 5: Solve for x
    x = 135,651,432.88/13,142.58
  6. Step 6: Final answer
    x = 10,321.53

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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.