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Finding the Fourth Proportional to 18,861.28, 28,298.06 and 8,999.28

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Solution

The fourth proportional to 18,861.28, 28,298.06 and 8,999.28 is: 13,501.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.28 : 28,298.06 = 8,999.28 : x
  2. Step 2: Convert to fraction form
    18,861.28/28,298.06 = 8,999.28/x
  3. Step 3: Cross multiply
    18,861.28x = 28,298.06 × 8,999.28
  4. Step 4: Simplify right side
    18,861.28x = 254,662,154.15
  5. Step 5: Solve for x
    x = 254,662,154.15/18,861.28
  6. Step 6: Final answer
    x = 13,501.85

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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.