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Finding the Fourth Proportional to 275.03, 412.19 and 128.58

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Solution

The fourth proportional to 275.03, 412.19 and 128.58 is: 192.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.03 : 412.19 = 128.58 : x
  2. Step 2: Convert to fraction form
    275.03/412.19 = 128.58/x
  3. Step 3: Cross multiply
    275.03x = 412.19 × 128.58
  4. Step 4: Simplify right side
    275.03x = 52,999.39
  5. Step 5: Solve for x
    x = 52,999.39/275.03
  6. Step 6: Final answer
    x = 192.70

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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.