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Finding the Fourth Proportional to 78,676.32, 118,024.79 and 28,779.92

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Solution

The fourth proportional to 78,676.32, 118,024.79 and 28,779.92 is: 43,173.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,676.32 : 118,024.79 = 28,779.92 : x
  2. Step 2: Convert to fraction form
    78,676.32/118,024.79 = 28,779.92/x
  3. Step 3: Cross multiply
    78,676.32x = 118,024.79 × 28,779.92
  4. Step 4: Simplify right side
    78,676.32x = 3,396,743,280.19
  5. Step 5: Solve for x
    x = 3,396,743,280.19/78,676.32
  6. Step 6: Final answer
    x = 43,173.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.