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Finding the Fourth Proportional to 18,988.86, 28,339.17 and 18,546.60

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Solution

The fourth proportional to 18,988.86, 28,339.17 and 18,546.60 is: 27,679.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.86 : 28,339.17 = 18,546.60 : x
  2. Step 2: Convert to fraction form
    18,988.86/28,339.17 = 18,546.60/x
  3. Step 3: Cross multiply
    18,988.86x = 28,339.17 × 18,546.60
  4. Step 4: Simplify right side
    18,988.86x = 525,595,250.32
  5. Step 5: Solve for x
    x = 525,595,250.32/18,988.86
  6. Step 6: Final answer
    x = 27,679.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.