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Finding the Fourth Proportional to 420.16, 628.96 and 265.56

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Solution

The fourth proportional to 420.16, 628.96 and 265.56 is: 397.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.16 : 628.96 = 265.56 : x
  2. Step 2: Convert to fraction form
    420.16/628.96 = 265.56/x
  3. Step 3: Cross multiply
    420.16x = 628.96 × 265.56
  4. Step 4: Simplify right side
    420.16x = 167,026.62
  5. Step 5: Solve for x
    x = 167,026.62/420.16
  6. Step 6: Final answer
    x = 397.53

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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.