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Finding the Fourth Proportional to 130.09, 178.90 and 103.55

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Solution

The fourth proportional to 130.09, 178.90 and 103.55 is: 142.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.09 : 178.90 = 103.55 : x
  2. Step 2: Convert to fraction form
    130.09/178.90 = 103.55/x
  3. Step 3: Cross multiply
    130.09x = 178.90 × 103.55
  4. Step 4: Simplify right side
    130.09x = 18,524.20
  5. Step 5: Solve for x
    x = 18,524.20/130.09
  6. Step 6: Final answer
    x = 142.40

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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.