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Finding the Fourth Proportional to 71,682.88, 98,911.20 and 39,851.68

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Solution

The fourth proportional to 71,682.88, 98,911.20 and 39,851.68 is: 54,989.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,682.88 : 98,911.20 = 39,851.68 : x
  2. Step 2: Convert to fraction form
    71,682.88/98,911.20 = 39,851.68/x
  3. Step 3: Cross multiply
    71,682.88x = 98,911.20 × 39,851.68
  4. Step 4: Simplify right side
    71,682.88x = 3,941,777,490.82
  5. Step 5: Solve for x
    x = 3,941,777,490.82/71,682.88
  6. Step 6: Final answer
    x = 54,989.11

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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.