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Finding the Fourth Proportional to 105.60, 145.58 and 68.75

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Solution

The fourth proportional to 105.60, 145.58 and 68.75 is: 94.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.60 : 145.58 = 68.75 : x
  2. Step 2: Convert to fraction form
    105.60/145.58 = 68.75/x
  3. Step 3: Cross multiply
    105.60x = 145.58 × 68.75
  4. Step 4: Simplify right side
    105.60x = 10,008.49
  5. Step 5: Solve for x
    x = 10,008.49/105.60
  6. Step 6: Final answer
    x = 94.77

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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.