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Finding the Fourth Proportional to 420.12, 629.13 and 265.58

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Solution

The fourth proportional to 420.12, 629.13 and 265.58 is: 397.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.12 : 629.13 = 265.58 : x
  2. Step 2: Convert to fraction form
    420.12/629.13 = 265.58/x
  3. Step 3: Cross multiply
    420.12x = 629.13 × 265.58
  4. Step 4: Simplify right side
    420.12x = 167,079.87
  5. Step 5: Solve for x
    x = 167,079.87/420.12
  6. Step 6: Final answer
    x = 397.70

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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.