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Finding the Fourth Proportional to 665.61, 917.91 and 480.30

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Solution

The fourth proportional to 665.61, 917.91 and 480.30 is: 662.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.61 : 917.91 = 480.30 : x
  2. Step 2: Convert to fraction form
    665.61/917.91 = 480.30/x
  3. Step 3: Cross multiply
    665.61x = 917.91 × 480.30
  4. Step 4: Simplify right side
    665.61x = 440,872.17
  5. Step 5: Solve for x
    x = 440,872.17/665.61
  6. Step 6: Final answer
    x = 662.36

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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.