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Finding the Fourth Proportional to 105.57, 145.38 and 103.18

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Solution

The fourth proportional to 105.57, 145.38 and 103.18 is: 142.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.57 : 145.38 = 103.18 : x
  2. Step 2: Convert to fraction form
    105.57/145.38 = 103.18/x
  3. Step 3: Cross multiply
    105.57x = 145.38 × 103.18
  4. Step 4: Simplify right side
    105.57x = 14,999.07
  5. Step 5: Solve for x
    x = 14,999.07/105.57
  6. Step 6: Final answer
    x = 142.08

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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.