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Finding the Fourth Proportional to 307.64, 461.58 and 145.21

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Solution

The fourth proportional to 307.64, 461.58 and 145.21 is: 217.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.64 : 461.58 = 145.21 : x
  2. Step 2: Convert to fraction form
    307.64/461.58 = 145.21/x
  3. Step 3: Cross multiply
    307.64x = 461.58 × 145.21
  4. Step 4: Simplify right side
    307.64x = 67,026.03
  5. Step 5: Solve for x
    x = 67,026.03/307.64
  6. Step 6: Final answer
    x = 217.87

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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.