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Finding the Fourth Proportional to 71,822.21, 99,113.96 and 39,989.21

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Solution

The fourth proportional to 71,822.21, 99,113.96 and 39,989.21 is: 55,184.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,822.21 : 99,113.96 = 39,989.21 : x
  2. Step 2: Convert to fraction form
    71,822.21/99,113.96 = 39,989.21/x
  3. Step 3: Cross multiply
    71,822.21x = 99,113.96 × 39,989.21
  4. Step 4: Simplify right side
    71,822.21x = 3,963,488,564.77
  5. Step 5: Solve for x
    x = 3,963,488,564.77/71,822.21
  6. Step 6: Final answer
    x = 55,184.72

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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.