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Finding the Fourth Proportional to 111,911.52, 154,458.60 and 64,165.20

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Solution

The fourth proportional to 111,911.52, 154,458.60 and 64,165.20 is: 88,559.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,911.52 : 154,458.60 = 64,165.20 : x
  2. Step 2: Convert to fraction form
    111,911.52/154,458.60 = 64,165.20/x
  3. Step 3: Cross multiply
    111,911.52x = 154,458.60 × 64,165.20
  4. Step 4: Simplify right side
    111,911.52x = 9,910,866,960.72
  5. Step 5: Solve for x
    x = 9,910,866,960.72/111,911.52
  6. Step 6: Final answer
    x = 88,559.85

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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.