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Finding the Fourth Proportional to 665.48, 918.45 and 479.58

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Solution

The fourth proportional to 665.48, 918.45 and 479.58 is: 661.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.48 : 918.45 = 479.58 : x
  2. Step 2: Convert to fraction form
    665.48/918.45 = 479.58/x
  3. Step 3: Cross multiply
    665.48x = 918.45 × 479.58
  4. Step 4: Simplify right side
    665.48x = 440,470.25
  5. Step 5: Solve for x
    x = 440,470.25/665.48
  6. Step 6: Final answer
    x = 661.88

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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.