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Finding the Fourth Proportional to 448.20, 670.40 and 436.42

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Solution

The fourth proportional to 448.20, 670.40 and 436.42 is: 652.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.20 : 670.40 = 436.42 : x
  2. Step 2: Convert to fraction form
    448.20/670.40 = 436.42/x
  3. Step 3: Cross multiply
    448.20x = 670.40 × 436.42
  4. Step 4: Simplify right side
    448.20x = 292,575.97
  5. Step 5: Solve for x
    x = 292,575.97/448.20
  6. Step 6: Final answer
    x = 652.78

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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.