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Finding the Fourth Proportional to 18,868, 28,275.12 and 8,999.20

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Solution

The fourth proportional to 18,868, 28,275.12 and 8,999.20 is: 13,485.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,868 : 28,275.12 = 8,999.20 : x
  2. Step 2: Convert to fraction form
    18,868/28,275.12 = 8,999.20/x
  3. Step 3: Cross multiply
    18,868x = 28,275.12 × 8,999.20
  4. Step 4: Simplify right side
    18,868x = 254,453,459.90
  5. Step 5: Solve for x
    x = 254,453,459.90/18,868
  6. Step 6: Final answer
    x = 13,485.98

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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.