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Finding the Fourth Proportional to 420.95, 629.99 and 384.43

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Solution

The fourth proportional to 420.95, 629.99 and 384.43 is: 575.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.95 : 629.99 = 384.43 : x
  2. Step 2: Convert to fraction form
    420.95/629.99 = 384.43/x
  3. Step 3: Cross multiply
    420.95x = 629.99 × 384.43
  4. Step 4: Simplify right side
    420.95x = 242,185.13
  5. Step 5: Solve for x
    x = 242,185.13/420.95
  6. Step 6: Final answer
    x = 575.34

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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.