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Finding the Fourth Proportional to 99,399.37, 149,128.44 and 57,309.64

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Solution

The fourth proportional to 99,399.37, 149,128.44 and 57,309.64 is: 85,981.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,399.37 : 149,128.44 = 57,309.64 : x
  2. Step 2: Convert to fraction form
    99,399.37/149,128.44 = 57,309.64/x
  3. Step 3: Cross multiply
    99,399.37x = 149,128.44 × 57,309.64
  4. Step 4: Simplify right side
    99,399.37x = 8,546,496,923.61
  5. Step 5: Solve for x
    x = 8,546,496,923.61/99,399.37
  6. Step 6: Final answer
    x = 85,981.40

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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.