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Finding the Fourth Proportional to 420.53, 629.91 and 356.18

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Solution

The fourth proportional to 420.53, 629.91 and 356.18 is: 533.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.53 : 629.91 = 356.18 : x
  2. Step 2: Convert to fraction form
    420.53/629.91 = 356.18/x
  3. Step 3: Cross multiply
    420.53x = 629.91 × 356.18
  4. Step 4: Simplify right side
    420.53x = 224,358.19
  5. Step 5: Solve for x
    x = 224,358.19/420.53
  6. Step 6: Final answer
    x = 533.52

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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.