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Finding the Fourth Proportional to 102.55, 141.71 and 79.30

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Solution

The fourth proportional to 102.55, 141.71 and 79.30 is: 109.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.55 : 141.71 = 79.30 : x
  2. Step 2: Convert to fraction form
    102.55/141.71 = 79.30/x
  3. Step 3: Cross multiply
    102.55x = 141.71 × 79.30
  4. Step 4: Simplify right side
    102.55x = 11,237.60
  5. Step 5: Solve for x
    x = 11,237.60/102.55
  6. Step 6: Final answer
    x = 109.58

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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.