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Finding the Fourth Proportional to 645.06, 889.92 and 479.68

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Solution

The fourth proportional to 645.06, 889.92 and 479.68 is: 661.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.06 : 889.92 = 479.68 : x
  2. Step 2: Convert to fraction form
    645.06/889.92 = 479.68/x
  3. Step 3: Cross multiply
    645.06x = 889.92 × 479.68
  4. Step 4: Simplify right side
    645.06x = 426,876.83
  5. Step 5: Solve for x
    x = 426,876.83/645.06
  6. Step 6: Final answer
    x = 661.76

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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.