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Finding the Fourth Proportional to 99,485.64, 137,299.86 and 74,291.40

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Solution

The fourth proportional to 99,485.64, 137,299.86 and 74,291.40 is: 102,529.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,485.64 : 137,299.86 = 74,291.40 : x
  2. Step 2: Convert to fraction form
    99,485.64/137,299.86 = 74,291.40/x
  3. Step 3: Cross multiply
    99,485.64x = 137,299.86 × 74,291.40
  4. Step 4: Simplify right side
    99,485.64x = 10,200,198,819.20
  5. Step 5: Solve for x
    x = 10,200,198,819.20/99,485.64
  6. Step 6: Final answer
    x = 102,529.36

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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.