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Finding the Fourth Proportional to 78,751.76, 108,650.28 and 54,869.72

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Solution

The fourth proportional to 78,751.76, 108,650.28 and 54,869.72 is: 75,701.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,751.76 : 108,650.28 = 54,869.72 : x
  2. Step 2: Convert to fraction form
    78,751.76/108,650.28 = 54,869.72/x
  3. Step 3: Cross multiply
    78,751.76x = 108,650.28 × 54,869.72
  4. Step 4: Simplify right side
    78,751.76x = 5,961,610,441.52
  5. Step 5: Solve for x
    x = 5,961,610,441.52/78,751.76
  6. Step 6: Final answer
    x = 75,701.30

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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.