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Finding the Fourth Proportional to 78,779.52, 118,129.80 and 26,170.56

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Solution

The fourth proportional to 78,779.52, 118,129.80 and 26,170.56 is: 39,242.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,779.52 : 118,129.80 = 26,170.56 : x
  2. Step 2: Convert to fraction form
    78,779.52/118,129.80 = 26,170.56/x
  3. Step 3: Cross multiply
    78,779.52x = 118,129.80 × 26,170.56
  4. Step 4: Simplify right side
    78,779.52x = 3,091,523,018.69
  5. Step 5: Solve for x
    x = 3,091,523,018.69/78,779.52
  6. Step 6: Final answer
    x = 39,242.72

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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.