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Finding the Fourth Proportional to 665.68, 918.12 and 455.98

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Solution

The fourth proportional to 665.68, 918.12 and 455.98 is: 628.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.68 : 918.12 = 455.98 : x
  2. Step 2: Convert to fraction form
    665.68/918.12 = 455.98/x
  3. Step 3: Cross multiply
    665.68x = 918.12 × 455.98
  4. Step 4: Simplify right side
    665.68x = 418,644.36
  5. Step 5: Solve for x
    x = 418,644.36/665.68
  6. Step 6: Final answer
    x = 628.90

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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.