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Finding the Fourth Proportional to 665.75, 919.45 and 456.47

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Solution

The fourth proportional to 665.75, 919.45 and 456.47 is: 630.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.75 : 919.45 = 456.47 : x
  2. Step 2: Convert to fraction form
    665.75/919.45 = 456.47/x
  3. Step 3: Cross multiply
    665.75x = 919.45 × 456.47
  4. Step 4: Simplify right side
    665.75x = 419,700.76
  5. Step 5: Solve for x
    x = 419,700.76/665.75
  6. Step 6: Final answer
    x = 630.42

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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.