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Finding the Fourth Proportional to 448.08, 672.42 and 421.18

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Solution

The fourth proportional to 448.08, 672.42 and 421.18 is: 632.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.08 : 672.42 = 421.18 : x
  2. Step 2: Convert to fraction form
    448.08/672.42 = 421.18/x
  3. Step 3: Cross multiply
    448.08x = 672.42 × 421.18
  4. Step 4: Simplify right side
    448.08x = 283,209.86
  5. Step 5: Solve for x
    x = 283,209.86/448.08
  6. Step 6: Final answer
    x = 632.05

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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.