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Finding the Fourth Proportional to 420.70, 629.56 and 274.36

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Solution

The fourth proportional to 420.70, 629.56 and 274.36 is: 410.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.70 : 629.56 = 274.36 : x
  2. Step 2: Convert to fraction form
    420.70/629.56 = 274.36/x
  3. Step 3: Cross multiply
    420.70x = 629.56 × 274.36
  4. Step 4: Simplify right side
    420.70x = 172,726.08
  5. Step 5: Solve for x
    x = 172,726.08/420.70
  6. Step 6: Final answer
    x = 410.57

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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.