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Finding the Fourth Proportional to 71,678.45, 98,919.63 and 39,847.88

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Solution

The fourth proportional to 71,678.45, 98,919.63 and 39,847.88 is: 54,991.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,678.45 : 98,919.63 = 39,847.88 : x
  2. Step 2: Convert to fraction form
    71,678.45/98,919.63 = 39,847.88/x
  3. Step 3: Cross multiply
    71,678.45x = 98,919.63 × 39,847.88
  4. Step 4: Simplify right side
    71,678.45x = 3,941,737,051.29
  5. Step 5: Solve for x
    x = 3,941,737,051.29/71,678.45
  6. Step 6: Final answer
    x = 54,991.94

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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.