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Finding the Fourth Proportional to 448.07, 672.19 and 139.85

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Solution

The fourth proportional to 448.07, 672.19 and 139.85 is: 209.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.07 : 672.19 = 139.85 : x
  2. Step 2: Convert to fraction form
    448.07/672.19 = 139.85/x
  3. Step 3: Cross multiply
    448.07x = 672.19 × 139.85
  4. Step 4: Simplify right side
    448.07x = 94,007.10
  5. Step 5: Solve for x
    x = 94,007.10/448.07
  6. Step 6: Final answer
    x = 209.80

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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.