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Finding the Fourth Proportional to 71,321.09, 98,423.06 and 39,492

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Solution

The fourth proportional to 71,321.09, 98,423.06 and 39,492 is: 54,498.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,321.09 : 98,423.06 = 39,492 : x
  2. Step 2: Convert to fraction form
    71,321.09/98,423.06 = 39,492/x
  3. Step 3: Cross multiply
    71,321.09x = 98,423.06 × 39,492
  4. Step 4: Simplify right side
    71,321.09x = 3,886,923,288.06
  5. Step 5: Solve for x
    x = 3,886,923,288.06/71,321.09
  6. Step 6: Final answer
    x = 54,498.94

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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.