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Finding the Fourth Proportional to 85,613.38, 128,245.99 and 69,874.50

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Solution

The fourth proportional to 85,613.38, 128,245.99 and 69,874.50 is: 104,669.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,613.38 : 128,245.99 = 69,874.50 : x
  2. Step 2: Convert to fraction form
    85,613.38/128,245.99 = 69,874.50/x
  3. Step 3: Cross multiply
    85,613.38x = 128,245.99 × 69,874.50
  4. Step 4: Simplify right side
    85,613.38x = 8,961,124,428.26
  5. Step 5: Solve for x
    x = 8,961,124,428.26/85,613.38
  6. Step 6: Final answer
    x = 104,669.67

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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.