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Finding the Fourth Proportional to 419.76, 629.84 and 265.76

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Solution

The fourth proportional to 419.76, 629.84 and 265.76 is: 398.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.76 : 629.84 = 265.76 : x
  2. Step 2: Convert to fraction form
    419.76/629.84 = 265.76/x
  3. Step 3: Cross multiply
    419.76x = 629.84 × 265.76
  4. Step 4: Simplify right side
    419.76x = 167,386.16
  5. Step 5: Solve for x
    x = 167,386.16/419.76
  6. Step 6: Final answer
    x = 398.77

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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.