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Finding the Fourth Proportional to 443.36, 664.95 and 421.40

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Solution

The fourth proportional to 443.36, 664.95 and 421.40 is: 632.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.36 : 664.95 = 421.40 : x
  2. Step 2: Convert to fraction form
    443.36/664.95 = 421.40/x
  3. Step 3: Cross multiply
    443.36x = 664.95 × 421.40
  4. Step 4: Simplify right side
    443.36x = 280,209.93
  5. Step 5: Solve for x
    x = 280,209.93/443.36
  6. Step 6: Final answer
    x = 632.01

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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.