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Finding the Fourth Proportional to 20,758.40, 28,646.40 and 12,797.44

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Solution

The fourth proportional to 20,758.40, 28,646.40 and 12,797.44 is: 17,660.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,758.40 : 28,646.40 = 12,797.44 : x
  2. Step 2: Convert to fraction form
    20,758.40/28,646.40 = 12,797.44/x
  3. Step 3: Cross multiply
    20,758.40x = 28,646.40 × 12,797.44
  4. Step 4: Simplify right side
    20,758.40x = 366,600,585.22
  5. Step 5: Solve for x
    x = 366,600,585.22/20,758.40
  6. Step 6: Final answer
    x = 17,660.35

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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.