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Finding the Fourth Proportional to 123,805.80, 170,845.20 and 72,824.40

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Solution

The fourth proportional to 123,805.80, 170,845.20 and 72,824.40 is: 100,493.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,805.80 : 170,845.20 = 72,824.40 : x
  2. Step 2: Convert to fraction form
    123,805.80/170,845.20 = 72,824.40/x
  3. Step 3: Cross multiply
    123,805.80x = 170,845.20 × 72,824.40
  4. Step 4: Simplify right side
    123,805.80x = 12,441,699,182.88
  5. Step 5: Solve for x
    x = 12,441,699,182.88/123,805.80
  6. Step 6: Final answer
    x = 100,493.67

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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.