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Finding the Fourth Proportional to 448.21, 672.30 and 140.05

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Solution

The fourth proportional to 448.21, 672.30 and 140.05 is: 210.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.21 : 672.30 = 140.05 : x
  2. Step 2: Convert to fraction form
    448.21/672.30 = 140.05/x
  3. Step 3: Cross multiply
    448.21x = 672.30 × 140.05
  4. Step 4: Simplify right side
    448.21x = 94,156.46
  5. Step 5: Solve for x
    x = 94,156.46/448.21
  6. Step 6: Final answer
    x = 210.07

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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.