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Finding the Fourth Proportional to 100,809.09, 139,136.04 and 66,819.42

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Solution

The fourth proportional to 100,809.09, 139,136.04 and 66,819.42 is: 92,223.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,809.09 : 139,136.04 = 66,819.42 : x
  2. Step 2: Convert to fraction form
    100,809.09/139,136.04 = 66,819.42/x
  3. Step 3: Cross multiply
    100,809.09x = 139,136.04 × 66,819.42
  4. Step 4: Simplify right side
    100,809.09x = 9,296,989,493.90
  5. Step 5: Solve for x
    x = 9,296,989,493.90/100,809.09
  6. Step 6: Final answer
    x = 92,223.72

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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.