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Finding the Fourth Proportional to 483.72, 723.74 and 421.76

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Solution

The fourth proportional to 483.72, 723.74 and 421.76 is: 631.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.72 : 723.74 = 421.76 : x
  2. Step 2: Convert to fraction form
    483.72/723.74 = 421.76/x
  3. Step 3: Cross multiply
    483.72x = 723.74 × 421.76
  4. Step 4: Simplify right side
    483.72x = 305,244.58
  5. Step 5: Solve for x
    x = 305,244.58/483.72
  6. Step 6: Final answer
    x = 631.04

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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.