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Finding the Fourth Proportional to 448.21, 672.07 and 139.98

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Solution

The fourth proportional to 448.21, 672.07 and 139.98 is: 209.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.21 : 672.07 = 139.98 : x
  2. Step 2: Convert to fraction form
    448.21/672.07 = 139.98/x
  3. Step 3: Cross multiply
    448.21x = 672.07 × 139.98
  4. Step 4: Simplify right side
    448.21x = 94,076.36
  5. Step 5: Solve for x
    x = 94,076.36/448.21
  6. Step 6: Final answer
    x = 209.89

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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.