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Finding the Fourth Proportional to 71,520.93, 98,698.23 and 39,690.09

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Solution

The fourth proportional to 71,520.93, 98,698.23 and 39,690.09 is: 54,771.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520.93 : 98,698.23 = 39,690.09 : x
  2. Step 2: Convert to fraction form
    71,520.93/98,698.23 = 39,690.09/x
  3. Step 3: Cross multiply
    71,520.93x = 98,698.23 × 39,690.09
  4. Step 4: Simplify right side
    71,520.93x = 3,917,341,631.54
  5. Step 5: Solve for x
    x = 3,917,341,631.54/71,520.93
  6. Step 6: Final answer
    x = 54,771.96

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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.