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Finding the Fourth Proportional to 105.42, 145.47 and 61.16

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Solution

The fourth proportional to 105.42, 145.47 and 61.16 is: 84.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.42 : 145.47 = 61.16 : x
  2. Step 2: Convert to fraction form
    105.42/145.47 = 61.16/x
  3. Step 3: Cross multiply
    105.42x = 145.47 × 61.16
  4. Step 4: Simplify right side
    105.42x = 8,896.22
  5. Step 5: Solve for x
    x = 8,896.22/105.42
  6. Step 6: Final answer
    x = 84.39

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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.