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Finding the Fourth Proportional to 389,885.76, 538,012.32 and 220,136.64

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Solution

The fourth proportional to 389,885.76, 538,012.32 and 220,136.64 is: 303,771.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,885.76 : 538,012.32 = 220,136.64 : x
  2. Step 2: Convert to fraction form
    389,885.76/538,012.32 = 220,136.64/x
  3. Step 3: Cross multiply
    389,885.76x = 538,012.32 × 220,136.64
  4. Step 4: Simplify right side
    389,885.76x = 118,436,224,403.41
  5. Step 5: Solve for x
    x = 118,436,224,403.41/389,885.76
  6. Step 6: Final answer
    x = 303,771.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.