Home / 13,639.85-18,818.47-11,117.63

Finding the Fourth Proportional to 13,639.85, 18,818.47 and 11,117.63

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Solution

The fourth proportional to 13,639.85, 18,818.47 and 11,117.63 is: 15,338.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.85 : 18,818.47 = 11,117.63 : x
  2. Step 2: Convert to fraction form
    13,639.85/18,818.47 = 11,117.63/x
  3. Step 3: Cross multiply
    13,639.85x = 18,818.47 × 11,117.63
  4. Step 4: Simplify right side
    13,639.85x = 209,216,786.63
  5. Step 5: Solve for x
    x = 209,216,786.63/13,639.85
  6. Step 6: Final answer
    x = 15,338.64

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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.