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Finding the Fourth Proportional to 71,238.70, 98,309.49 and 39,409.75

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Solution

The fourth proportional to 71,238.70, 98,309.49 and 39,409.75 is: 54,385.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,238.70 : 98,309.49 = 39,409.75 : x
  2. Step 2: Convert to fraction form
    71,238.70/98,309.49 = 39,409.75/x
  3. Step 3: Cross multiply
    71,238.70x = 98,309.49 × 39,409.75
  4. Step 4: Simplify right side
    71,238.70x = 3,874,351,931.98
  5. Step 5: Solve for x
    x = 3,874,351,931.98/71,238.70
  6. Step 6: Final answer
    x = 54,385.50

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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.