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Finding the Fourth Proportional to 78,640.12, 108,600.48 and 67,243.81

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Solution

The fourth proportional to 78,640.12, 108,600.48 and 67,243.81 is: 92,862.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,640.12 : 108,600.48 = 67,243.81 : x
  2. Step 2: Convert to fraction form
    78,640.12/108,600.48 = 67,243.81/x
  3. Step 3: Cross multiply
    78,640.12x = 108,600.48 × 67,243.81
  4. Step 4: Simplify right side
    78,640.12x = 7,302,710,043.03
  5. Step 5: Solve for x
    x = 7,302,710,043.03/78,640.12
  6. Step 6: Final answer
    x = 92,862.40

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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.