Home / 20,602.31-28,431.20-11,170.87

Finding the Fourth Proportional to 20,602.31, 28,431.20 and 11,170.87

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Solution

The fourth proportional to 20,602.31, 28,431.20 and 11,170.87 is: 15,415.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,602.31 : 28,431.20 = 11,170.87 : x
  2. Step 2: Convert to fraction form
    20,602.31/28,431.20 = 11,170.87/x
  3. Step 3: Cross multiply
    20,602.31x = 28,431.20 × 11,170.87
  4. Step 4: Simplify right side
    20,602.31x = 317,601,133.16
  5. Step 5: Solve for x
    x = 317,601,133.16/20,602.31
  6. Step 6: Final answer
    x = 15,415.81

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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.