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Finding the Fourth Proportional to 307.68, 461.07 and 143.20

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Solution

The fourth proportional to 307.68, 461.07 and 143.20 is: 214.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.68 : 461.07 = 143.20 : x
  2. Step 2: Convert to fraction form
    307.68/461.07 = 143.20/x
  3. Step 3: Cross multiply
    307.68x = 461.07 × 143.20
  4. Step 4: Simplify right side
    307.68x = 66,025.22
  5. Step 5: Solve for x
    x = 66,025.22/307.68
  6. Step 6: Final answer
    x = 214.59

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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.