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Finding the Fourth Proportional to 105.24, 145.28 and 74.18

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Solution

The fourth proportional to 105.24, 145.28 and 74.18 is: 102.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.24 : 145.28 = 74.18 : x
  2. Step 2: Convert to fraction form
    105.24/145.28 = 74.18/x
  3. Step 3: Cross multiply
    105.24x = 145.28 × 74.18
  4. Step 4: Simplify right side
    105.24x = 10,776.87
  5. Step 5: Solve for x
    x = 10,776.87/105.24
  6. Step 6: Final answer
    x = 102.40

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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.