Home / 20,790.81-28,691.06-11,359.35

Finding the Fourth Proportional to 20,790.81, 28,691.06 and 11,359.35

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Solution

The fourth proportional to 20,790.81, 28,691.06 and 11,359.35 is: 15,675.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.81 : 28,691.06 = 11,359.35 : x
  2. Step 2: Convert to fraction form
    20,790.81/28,691.06 = 11,359.35/x
  3. Step 3: Cross multiply
    20,790.81x = 28,691.06 × 11,359.35
  4. Step 4: Simplify right side
    20,790.81x = 325,911,735.61
  5. Step 5: Solve for x
    x = 325,911,735.61/20,790.81
  6. Step 6: Final answer
    x = 15,675.76

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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.