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Finding the Fourth Proportional to 66,861.72, 100,298.96 and 18,830.20

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Solution

The fourth proportional to 66,861.72, 100,298.96 and 18,830.20 is: 28,247.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,861.72 : 100,298.96 = 18,830.20 : x
  2. Step 2: Convert to fraction form
    66,861.72/100,298.96 = 18,830.20/x
  3. Step 3: Cross multiply
    66,861.72x = 100,298.96 × 18,830.20
  4. Step 4: Simplify right side
    66,861.72x = 1,888,649,476.59
  5. Step 5: Solve for x
    x = 1,888,649,476.59/66,861.72
  6. Step 6: Final answer
    x = 28,247.10

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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.