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Finding the Fourth Proportional to 20,993.81, 28,972.07 and 11,434.32

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Solution

The fourth proportional to 20,993.81, 28,972.07 and 11,434.32 is: 15,779.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.81 : 28,972.07 = 11,434.32 : x
  2. Step 2: Convert to fraction form
    20,993.81/28,972.07 = 11,434.32/x
  3. Step 3: Cross multiply
    20,993.81x = 28,972.07 × 11,434.32
  4. Step 4: Simplify right side
    20,993.81x = 331,275,862.27
  5. Step 5: Solve for x
    x = 331,275,862.27/20,993.81
  6. Step 6: Final answer
    x = 15,779.70

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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.