Home / 20,982.01-28,955.19-11,421.85

Finding the Fourth Proportional to 20,982.01, 28,955.19 and 11,421.85

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Solution

The fourth proportional to 20,982.01, 28,955.19 and 11,421.85 is: 15,762.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.01 : 28,955.19 = 11,421.85 : x
  2. Step 2: Convert to fraction form
    20,982.01/28,955.19 = 11,421.85/x
  3. Step 3: Cross multiply
    20,982.01x = 28,955.19 × 11,421.85
  4. Step 4: Simplify right side
    20,982.01x = 330,721,836.90
  5. Step 5: Solve for x
    x = 330,721,836.90/20,982.01
  6. Step 6: Final answer
    x = 15,762.16

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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.