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Finding the Fourth Proportional to 71,138.40, 98,172.90 and 39,309.30

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Solution

The fourth proportional to 71,138.40, 98,172.90 and 39,309.30 is: 54,247.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,138.40 : 98,172.90 = 39,309.30 : x
  2. Step 2: Convert to fraction form
    71,138.40/98,172.90 = 39,309.30/x
  3. Step 3: Cross multiply
    71,138.40x = 98,172.90 × 39,309.30
  4. Step 4: Simplify right side
    71,138.40x = 3,859,107,977.97
  5. Step 5: Solve for x
    x = 3,859,107,977.97/71,138.40
  6. Step 6: Final answer
    x = 54,247.89

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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.