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Finding the Fourth Proportional to 111,909.20, 154,434.60 and 61,608.20

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Solution

The fourth proportional to 111,909.20, 154,434.60 and 61,608.20 is: 85,019.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,909.20 : 154,434.60 = 61,608.20 : x
  2. Step 2: Convert to fraction form
    111,909.20/154,434.60 = 61,608.20/x
  3. Step 3: Cross multiply
    111,909.20x = 154,434.60 × 61,608.20
  4. Step 4: Simplify right side
    111,909.20x = 9,514,436,951.55
  5. Step 5: Solve for x
    x = 9,514,436,951.55/111,909.20
  6. Step 6: Final answer
    x = 85,019.26

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.