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Finding the Fourth Proportional to 71,651.75, 98,879.45 and 39,820.64

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Solution

The fourth proportional to 71,651.75, 98,879.45 and 39,820.64 is: 54,952.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,651.75 : 98,879.45 = 39,820.64 : x
  2. Step 2: Convert to fraction form
    71,651.75/98,879.45 = 39,820.64/x
  3. Step 3: Cross multiply
    71,651.75x = 98,879.45 × 39,820.64
  4. Step 4: Simplify right side
    71,651.75x = 3,937,442,288.35
  5. Step 5: Solve for x
    x = 3,937,442,288.35/71,651.75
  6. Step 6: Final answer
    x = 54,952.50

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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.