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Finding the Fourth Proportional to 275.30, 412.85 and 129.02

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Solution

The fourth proportional to 275.30, 412.85 and 129.02 is: 193.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.30 : 412.85 = 129.02 : x
  2. Step 2: Convert to fraction form
    275.30/412.85 = 129.02/x
  3. Step 3: Cross multiply
    275.30x = 412.85 × 129.02
  4. Step 4: Simplify right side
    275.30x = 53,266.15
  5. Step 5: Solve for x
    x = 53,266.15/275.30
  6. Step 6: Final answer
    x = 193.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.