Home / 20,660.15-28,510.43-11,228.71

Finding the Fourth Proportional to 20,660.15, 28,510.43 and 11,228.71

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Solution

The fourth proportional to 20,660.15, 28,510.43 and 11,228.71 is: 15,495.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660.15 : 28,510.43 = 11,228.71 : x
  2. Step 2: Convert to fraction form
    20,660.15/28,510.43 = 11,228.71/x
  3. Step 3: Cross multiply
    20,660.15x = 28,510.43 × 11,228.71
  4. Step 4: Simplify right side
    20,660.15x = 320,135,350.45
  5. Step 5: Solve for x
    x = 320,135,350.45/20,660.15
  6. Step 6: Final answer
    x = 15,495.31

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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.