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Finding the Fourth Proportional to 105.20, 145.18 and 61.53

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Solution

The fourth proportional to 105.20, 145.18 and 61.53 is: 84.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.20 : 145.18 = 61.53 : x
  2. Step 2: Convert to fraction form
    105.20/145.18 = 61.53/x
  3. Step 3: Cross multiply
    105.20x = 145.18 × 61.53
  4. Step 4: Simplify right side
    105.20x = 8,933.55
  5. Step 5: Solve for x
    x = 8,933.55/105.20
  6. Step 6: Final answer
    x = 84.92

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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.