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Finding the Fourth Proportional to 665.14, 918.11 and 455.24

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Solution

The fourth proportional to 665.14, 918.11 and 455.24 is: 628.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.14 : 918.11 = 455.24 : x
  2. Step 2: Convert to fraction form
    665.14/918.11 = 455.24/x
  3. Step 3: Cross multiply
    665.14x = 918.11 × 455.24
  4. Step 4: Simplify right side
    665.14x = 417,955.82
  5. Step 5: Solve for x
    x = 417,955.82/665.14
  6. Step 6: Final answer
    x = 628.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.