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Finding the Fourth Proportional to 421.01, 631.43 and 143.33

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Solution

The fourth proportional to 421.01, 631.43 and 143.33 is: 214.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.01 : 631.43 = 143.33 : x
  2. Step 2: Convert to fraction form
    421.01/631.43 = 143.33/x
  3. Step 3: Cross multiply
    421.01x = 631.43 × 143.33
  4. Step 4: Simplify right side
    421.01x = 90,501.91
  5. Step 5: Solve for x
    x = 90,501.91/421.01
  6. Step 6: Final answer
    x = 214.96

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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.