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Finding the Fourth Proportional to 71,469.90, 98,622 and 39,638.70

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Solution

The fourth proportional to 71,469.90, 98,622 and 39,638.70 is: 54,697.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,469.90 : 98,622 = 39,638.70 : x
  2. Step 2: Convert to fraction form
    71,469.90/98,622 = 39,638.70/x
  3. Step 3: Cross multiply
    71,469.90x = 98,622 × 39,638.70
  4. Step 4: Simplify right side
    71,469.90x = 3,909,247,871.40
  5. Step 5: Solve for x
    x = 3,909,247,871.40/71,469.90
  6. Step 6: Final answer
    x = 54,697.82

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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.