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Finding the Fourth Proportional to 72,790.12, 100,505.12 and 71,627.59

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Solution

The fourth proportional to 72,790.12, 100,505.12 and 71,627.59 is: 98,899.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,790.12 : 100,505.12 = 71,627.59 : x
  2. Step 2: Convert to fraction form
    72,790.12/100,505.12 = 71,627.59/x
  3. Step 3: Cross multiply
    72,790.12x = 100,505.12 × 71,627.59
  4. Step 4: Simplify right side
    72,790.12x = 7,198,939,528.26
  5. Step 5: Solve for x
    x = 7,198,939,528.26/72,790.12
  6. Step 6: Final answer
    x = 98,899.95

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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.