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Finding the Fourth Proportional to 421.89, 631.29 and 248.64

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Solution

The fourth proportional to 421.89, 631.29 and 248.64 is: 372.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.89 : 631.29 = 248.64 : x
  2. Step 2: Convert to fraction form
    421.89/631.29 = 248.64/x
  3. Step 3: Cross multiply
    421.89x = 631.29 × 248.64
  4. Step 4: Simplify right side
    421.89x = 156,962.51
  5. Step 5: Solve for x
    x = 156,962.51/421.89
  6. Step 6: Final answer
    x = 372.04

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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.