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Finding the Fourth Proportional to 105.37, 145.47 and 99.43

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Solution

The fourth proportional to 105.37, 145.47 and 99.43 is: 137.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.37 : 145.47 = 99.43 : x
  2. Step 2: Convert to fraction form
    105.37/145.47 = 99.43/x
  3. Step 3: Cross multiply
    105.37x = 145.47 × 99.43
  4. Step 4: Simplify right side
    105.37x = 14,464.08
  5. Step 5: Solve for x
    x = 14,464.08/105.37
  6. Step 6: Final answer
    x = 137.27

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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.