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Finding the Fourth Proportional to 90,779.80, 136,121.10 and 38,129.80

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Solution

The fourth proportional to 90,779.80, 136,121.10 and 38,129.80 is: 57,174.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,779.80 : 136,121.10 = 38,129.80 : x
  2. Step 2: Convert to fraction form
    90,779.80/136,121.10 = 38,129.80/x
  3. Step 3: Cross multiply
    90,779.80x = 136,121.10 × 38,129.80
  4. Step 4: Simplify right side
    90,779.80x = 5,190,270,318.78
  5. Step 5: Solve for x
    x = 5,190,270,318.78/90,779.80
  6. Step 6: Final answer
    x = 57,174.29

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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.