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Finding the Fourth Proportional to 266,142.40, 399,213.60 and 139,733.80

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Solution

The fourth proportional to 266,142.40, 399,213.60 and 139,733.80 is: 209,600.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,142.40 : 399,213.60 = 139,733.80 : x
  2. Step 2: Convert to fraction form
    266,142.40/399,213.60 = 139,733.80/x
  3. Step 3: Cross multiply
    266,142.40x = 399,213.60 × 139,733.80
  4. Step 4: Simplify right side
    266,142.40x = 55,783,633,339.68
  5. Step 5: Solve for x
    x = 55,783,633,339.68/266,142.40
  6. Step 6: Final answer
    x = 209,600.70

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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.