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Finding the Fourth Proportional to 665.21, 917.43 and 479.93

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Solution

The fourth proportional to 665.21, 917.43 and 479.93 is: 661.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.21 : 917.43 = 479.93 : x
  2. Step 2: Convert to fraction form
    665.21/917.43 = 479.93/x
  3. Step 3: Cross multiply
    665.21x = 917.43 × 479.93
  4. Step 4: Simplify right side
    665.21x = 440,295.79
  5. Step 5: Solve for x
    x = 440,295.79/665.21
  6. Step 6: Final answer
    x = 661.89

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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.