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Finding the Fourth Proportional to 448.70, 672.85 and 205.30

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Solution

The fourth proportional to 448.70, 672.85 and 205.30 is: 307.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.70 : 672.85 = 205.30 : x
  2. Step 2: Convert to fraction form
    448.70/672.85 = 205.30/x
  3. Step 3: Cross multiply
    448.70x = 672.85 × 205.30
  4. Step 4: Simplify right side
    448.70x = 138,136.11
  5. Step 5: Solve for x
    x = 138,136.11/448.70
  6. Step 6: Final answer
    x = 307.86

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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.