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Finding the Fourth Proportional to 275.16, 412.51 and 128.83

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Solution

The fourth proportional to 275.16, 412.51 and 128.83 is: 193.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.16 : 412.51 = 128.83 : x
  2. Step 2: Convert to fraction form
    275.16/412.51 = 128.83/x
  3. Step 3: Cross multiply
    275.16x = 412.51 × 128.83
  4. Step 4: Simplify right side
    275.16x = 53,143.02
  5. Step 5: Solve for x
    x = 53,143.02/275.16
  6. Step 6: Final answer
    x = 193.14

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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.