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Finding the Fourth Proportional to 71,171.90, 98,213 and 39,338.90

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Solution

The fourth proportional to 71,171.90, 98,213 and 39,338.90 is: 54,285.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,171.90 : 98,213 = 39,338.90 : x
  2. Step 2: Convert to fraction form
    71,171.90/98,213 = 39,338.90/x
  3. Step 3: Cross multiply
    71,171.90x = 98,213 × 39,338.90
  4. Step 4: Simplify right side
    71,171.90x = 3,863,591,385.70
  5. Step 5: Solve for x
    x = 3,863,591,385.70/71,171.90
  6. Step 6: Final answer
    x = 54,285.35

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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.