Home / 13,615.45-18,788.61-9,138.58

Finding the Fourth Proportional to 13,615.45, 18,788.61 and 9,138.58

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Solution

The fourth proportional to 13,615.45, 18,788.61 and 9,138.58 is: 12,610.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.45 : 18,788.61 = 9,138.58 : x
  2. Step 2: Convert to fraction form
    13,615.45/18,788.61 = 9,138.58/x
  3. Step 3: Cross multiply
    13,615.45x = 18,788.61 × 9,138.58
  4. Step 4: Simplify right side
    13,615.45x = 171,701,215.57
  5. Step 5: Solve for x
    x = 171,701,215.57/13,615.45
  6. Step 6: Final answer
    x = 12,610.76

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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.