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Finding the Fourth Proportional to 448.55, 672.80 and 140.38

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Solution

The fourth proportional to 448.55, 672.80 and 140.38 is: 210.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.55 : 672.80 = 140.38 : x
  2. Step 2: Convert to fraction form
    448.55/672.80 = 140.38/x
  3. Step 3: Cross multiply
    448.55x = 672.80 × 140.38
  4. Step 4: Simplify right side
    448.55x = 94,447.66
  5. Step 5: Solve for x
    x = 94,447.66/448.55
  6. Step 6: Final answer
    x = 210.56

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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.