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Finding the Fourth Proportional to 476.23, 714.36 and 421.87

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Solution

The fourth proportional to 476.23, 714.36 and 421.87 is: 632.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.23 : 714.36 = 421.87 : x
  2. Step 2: Convert to fraction form
    476.23/714.36 = 421.87/x
  3. Step 3: Cross multiply
    476.23x = 714.36 × 421.87
  4. Step 4: Simplify right side
    476.23x = 301,367.05
  5. Step 5: Solve for x
    x = 301,367.05/476.23
  6. Step 6: Final answer
    x = 632.82

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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.