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Finding the Fourth Proportional to 71,638.86, 98,867.86 and 39,809.81

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Solution

The fourth proportional to 71,638.86, 98,867.86 and 39,809.81 is: 54,941.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,638.86 : 98,867.86 = 39,809.81 : x
  2. Step 2: Convert to fraction form
    71,638.86/98,867.86 = 39,809.81/x
  3. Step 3: Cross multiply
    71,638.86x = 98,867.86 × 39,809.81
  4. Step 4: Simplify right side
    71,638.86x = 3,935,910,869.35
  5. Step 5: Solve for x
    x = 3,935,910,869.35/71,638.86
  6. Step 6: Final answer
    x = 54,941.00

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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.