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Finding the Fourth Proportional to 266,255.81, 399,500.81 and 139,866.75

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Solution

The fourth proportional to 266,255.81, 399,500.81 and 139,866.75 is: 209,861.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,255.81 : 399,500.81 = 139,866.75 : x
  2. Step 2: Convert to fraction form
    266,255.81/399,500.81 = 139,866.75/x
  3. Step 3: Cross multiply
    266,255.81x = 399,500.81 × 139,866.75
  4. Step 4: Simplify right side
    266,255.81x = 55,876,879,742.23
  5. Step 5: Solve for x
    x = 55,876,879,742.23/266,255.81
  6. Step 6: Final answer
    x = 209,861.64

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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.