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Finding the Fourth Proportional to 18,785.80, 28,173.90 and 7,689.48

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Solution

The fourth proportional to 18,785.80, 28,173.90 and 7,689.48 is: 11,532.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,785.80 : 28,173.90 = 7,689.48 : x
  2. Step 2: Convert to fraction form
    18,785.80/28,173.90 = 7,689.48/x
  3. Step 3: Cross multiply
    18,785.80x = 28,173.90 × 7,689.48
  4. Step 4: Simplify right side
    18,785.80x = 216,642,640.57
  5. Step 5: Solve for x
    x = 216,642,640.57/18,785.80
  6. Step 6: Final answer
    x = 11,532.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.