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Finding the Fourth Proportional to 18,988.68, 28,480.44 and 5,661.44

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Solution

The fourth proportional to 18,988.68, 28,480.44 and 5,661.44 is: 8,491.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.68 : 28,480.44 = 5,661.44 : x
  2. Step 2: Convert to fraction form
    18,988.68/28,480.44 = 5,661.44/x
  3. Step 3: Cross multiply
    18,988.68x = 28,480.44 × 5,661.44
  4. Step 4: Simplify right side
    18,988.68x = 161,240,302.23
  5. Step 5: Solve for x
    x = 161,240,302.23/18,988.68
  6. Step 6: Final answer
    x = 8,491.39

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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.