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Finding the Fourth Proportional to 105.24, 145.40 and 86.08

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Solution

The fourth proportional to 105.24, 145.40 and 86.08 is: 118.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.24 : 145.40 = 86.08 : x
  2. Step 2: Convert to fraction form
    105.24/145.40 = 86.08/x
  3. Step 3: Cross multiply
    105.24x = 145.40 × 86.08
  4. Step 4: Simplify right side
    105.24x = 12,516.03
  5. Step 5: Solve for x
    x = 12,516.03/105.24
  6. Step 6: Final answer
    x = 118.93

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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.