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Finding the Fourth Proportional to 100,884.30, 139,214.99 and 57,861.57

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Solution

The fourth proportional to 100,884.30, 139,214.99 and 57,861.57 is: 79,845.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,884.30 : 139,214.99 = 57,861.57 : x
  2. Step 2: Convert to fraction form
    100,884.30/139,214.99 = 57,861.57/x
  3. Step 3: Cross multiply
    100,884.30x = 139,214.99 × 57,861.57
  4. Step 4: Simplify right side
    100,884.30x = 8,055,197,599.63
  5. Step 5: Solve for x
    x = 8,055,197,599.63/100,884.30
  6. Step 6: Final answer
    x = 79,845.90

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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.